The best synonym for which depends on how you use it. Common alternatives include that, what, whichever, whatever, who, whom, whose, where, when, and the one that. Use that to identify something, what to ask an open question, and whichever when any option is acceptable. In some sentences, rewriting the sentence is the clearest choice.
Key Takeaways
- That often replaces which when identifying a specific thing in American English.
- What works well for open questions, while which usually asks someone to choose from a known set.
- Whichever means any option that meets your needs.
- Use who for people and where for places when the sentence calls for those meanings.
- Do not replace which blindly. Check the grammar and meaning first.
What Does “Which” Mean?
The word which helps identify a particular person or thing from a group. It can also introduce extra information about something already mentioned.
For example:
- Question: Which book do you want to read?
- Relative clause: The book, which I bought yesterday, is on my desk.
In the first sentence, which asks you to choose a book. In the second, it adds information about the book.
Because these uses are different, there is no single synonym that works in every sentence. The right replacement depends on the sentence’s purpose and structure.
10 Synonyms for Which and How to Use Them
Here are 10 useful alternatives, along with their meanings and examples.
1. That
Meaning: Identifies a particular person, thing, or idea.
That is one of the most useful alternatives to which in American English. It commonly introduces an essential clause that tells readers exactly which thing you mean.
Example:
- Original: The laptop which I purchased last week works well.
- Alternative: The laptop that I purchased last week works well.
The second sentence is natural in American English. The clause identifies the laptop, so it does not need commas.
However, that cannot replace which in every relative clause. When which introduces extra information about an already identified thing, keep which.
2. What
Meaning: Asks about or refers to a thing, fact, or information.
Use what when asking an open question or referring to something without limiting the answer to a known group.
Examples:
- Which movie should we watch, the comedy or the drama?
- What movie would you like to watch?
The first question presents two choices. The second invites a broader answer.
You can also use what in sentences such as, “I understand what you mean.” However, you cannot always substitute it directly for which in a relative clause.
3. Whichever
Meaning: Any one of the available choices.
Use whichever when the exact choice does not matter or when every option is acceptable.
Examples:
- Choose whichever seat is available.
- Take whichever route gets you there faster.
Compare this with “Which seat is available?” The first sentence permits a choice, while the second asks for information.
Whichever is especially useful when giving instructions, offering freedom of choice, or explaining that several options are acceptable.
4. Whatever
Meaning: Anything or everything that fits the situation.
Whatever is broader than whichever in many contexts. It often refers to an unrestricted thing, action, or possibility.
Examples:
- Choose whatever makes you happy.
- Bring whatever supplies you need.
Use whichever when referring to alternatives within a group. Use whatever when the range of possibilities is more open or the specific thing is not important.
For example, “Choose whichever of these two designs you prefer” is more precise than “Choose whatever” when only two designs are available.
5. Who
Meaning: Refers to a person acting as the subject of a clause.
Although who is not a direct synonym for which in every situation, it is the correct replacement when identifying a person in many relative clauses.
Example:
- Incorrect: The teacher which helped me was patient.
- Correct: The teacher who helped me was patient.
Use who when the person performs the action. In the example, the teacher performs the action of helping.
This distinction improves grammar and makes sentences sound more natural.
6. Whom
Meaning: Refers to a person receiving an action or serving as an object.
Whom is more formal than who in everyday American English. It often appears in academic, professional, and formal writing.
Examples:
- The student whom I met was friendly.
- To whom should I send the application?
In casual speech, many Americans use who instead of whom in some of these situations. Still, whom can be useful when you want a more formal tone.
It is not a universal substitute for which. Use it only when the sentence refers to a person and its grammar calls for an object form.
7. Whose
Meaning: Shows ownership or a relationship.
Use whose when you want to identify someone or something through possession.
Examples:
- The writer whose article I read lives in Texas.
- We met a student whose project won first prize.
In the first example, whose connects the writer with the article. In the second, it connects the student with the project.
Do not use whose simply to avoid repeating which. It adds a specific meaning that other alternatives do not provide.
8. Where
Meaning: Refers to a place or location.
Where can replace a phrase containing which when the sentence describes a location.
Examples:
- Original: This is the house in which I grew up.
- Alternative: This is the house where I grew up.
Both sentences are grammatical. The second sounds more conversational, while the first is more formal.
You can also write, “The town where we met is beautiful.”
Remember that where refers to a place. It does not replace which when the sentence discusses an object, idea, or event without a location meaning.
9. When
Meaning: Refers to a time, day, period, or occasion.
Use when to connect an event with the time it happened.
Examples:
- Original: I remember the day on which we first met.
- Alternative: I remember the day when we first met.
The second version is shorter and more natural in everyday writing.
You can also say, “Friday is the day when the results will arrive.”
In some sentences, you can remove the relative word entirely: “I remember the day we first met.” The meaning remains clear.
10. The One That
Meaning: Identifies a particular person or thing from a group.
Sometimes, the clearest alternative is a short phrase rather than a single word.
Examples:
- Which shirt should I buy?
- Buy the one that fits best.
The phrase the one that works well when you want to refer to a specific choice without repeating a noun.
You can use similar phrases, such as the option that, the book that, or the answer that, depending on the context.
These phrases are especially useful in everyday conversation and explanatory writing.
Which vs. That vs. What
These three words are related, but they do not serve exactly the same purpose.
| Word | Main use | Example |
|---|---|---|
| Which | Asks someone to identify a choice or adds information | Which route should we take? |
| That | Identifies something in an essential relative clause | The route that saves time is best. |
| What | Asks an open question or refers to information | What route would you suggest? |
When Should You Use That Instead of Which?
In American English, that is commonly preferred in a relative clause that identifies the noun. This is often called a restrictive clause because the information is essential to the sentence’s meaning.
Example: The phone that has a cracked screen belongs to me.
The clause identifies which phone belongs to the speaker.
By contrast, which commonly introduces extra information set off by commas.
Example: My phone, which has a cracked screen, still works.
Here, the reader already knows which phone is being discussed. The detail about the screen adds information.
This is a helpful American English editing guideline, not a universal rule for every variety of English. Also, when which follows a preposition, such as in “the situation in which we met,” replacing it with that may require restructuring the sentence.
How to Choose the Right Synonym for Which
Follow these three steps to choose the best alternative.
Step 1: Identify the meaning. Is the sentence asking a question, identifying an object, adding information, or offering a choice?
Step 2: Check the grammar. Use who for a person acting as the subject, whose for possession, where for place, and when for time when the sentence requires those meanings.
Step 3: Read the revised sentence aloud. If the alternative sounds awkward or changes the meaning, keep which or rewrite the sentence.
Consider this example:
Original: “The report, which was prepared by our team, explains the results.”
Alternative: “Our team’s report explains the results.”
The revised sentence removes the relative clause entirely. It is shorter and keeps the central meaning.
You do not have to replace every occurrence of which. The goal is clear writing, not using as many synonyms as possible.
Common Mistakes to Avoid
1. Replacing which with that without checking the clause
Incorrect: My car, that is parked outside, needs fuel.
Better: My car, which is parked outside, needs fuel.
The clause adds extra information, so which is appropriate with commas.
2. Using which to refer to a person
Incorrect: The woman which called me was helpful.
Better: The woman who called me was helpful.
3. Treating what and which as identical
“Which color do you prefer, blue or green?” presents a limited choice. “What color do you like?” allows a broader answer.
4. Using formal words just to sound intelligent
Words such as wherein and whereby have specific meanings. They are not general replacements for which. In modern writing, a simpler sentence is often easier to understand.
5. Removing which when it is needed
Incorrect: The dog barked at the stranger, surprised everyone.
Better: The dog barked at the stranger, which surprised everyone.
Alternatively, write: “The dog barked at the stranger. This surprised everyone.”
The right solution depends on the relationship between the ideas.
Frequently Asked Questions
What is the best synonym for which?
The best alternative depends on the sentence. Use that for many essential relative clauses, what for open questions, and whichever when any available option is acceptable. If which introduces extra information, you may need to keep it or rewrite the sentence.
Can I use that instead of which?
Yes, in many identifying relative clauses in American English. For example, “The book that I borrowed is interesting.” However, that generally does not replace which in a nonrestrictive clause set off by commas. Always check the sentence structure before making the substitution.
What is the difference between which and whichever?
Which usually asks someone to identify a particular option or introduces information about something. Whichever means any option that meets the conditions or that someone prefers. “Which seat is yours?” asks for identification, while “Choose whichever seat you like” allows a free choice.
How can I avoid repeating which in an essay?
First, decide whether each use is necessary. You may replace which with that in a suitable identifying clause, remove it when it is an optional object relative pronoun, or rewrite the sentence. Do not remove it when doing so would make the sentence ungrammatical or unclear.
Is whichever a formal word?
Whichever is a standard English word used in both formal and informal writing. It is useful when any member of a group can be selected. For example, “Applicants may choose whichever appointment time suits them.” Its formality is not the main issue; the important point is whether the meaning fits.
Can I start a sentence with which?
Yes, when which has a clear grammatical role and refers to something already mentioned. For example, “The meeting lasted three hours, which surprised everyone.” Starting a new sentence with which can also work in some contexts, but it may leave readers unsure what the word refers to. Rewriting is often clearer.
Conclusion
The best synonym for which depends on what you want your sentence to say. That can identify a specific thing, what can ask an open question, and whichever can express a free choice. Words such as who, whom, whose, where, and when work in their own grammatical contexts.
Before replacing which, check the meaning, grammar, and punctuation. Sometimes, the strongest edit is to keep the original word. Other times, a short rewrite creates a clearer and more natural sentence.
