Chigai vs Chigau Test

Both 違い（ちがい） and 違う（ちがう） come from the same root and are often translated as “difference” or “to differ” in English. But learners frequently mix them up or misuse one in place of the other. Understanding whether you need a noun or a verb is the key to getting this right every time.

Yuka

Rei, what is the difference between 違い and 違う?

Rei

Great question! 違い is a noun — it means “a difference.” 違う is a verb — it means “to differ” or “to be different.” Think of it like English: “difference” vs. “to differ.”

At a Glance

Chigai (違い) — The Noun Form

違い functions as a noun. You use it when you want to talk about “a difference” as a thing — something you can point to, describe, or discuss. It often follows the patterns 〜の違い (the difference between ~) or 〜との違い (the difference from ~).

Example 1:
Japanese: 二つの単語の違いを教えてください。
Romaji: Futatsu no tango no chigai wo oshiete kudasai.
English: Please tell me the difference between the two words.

Example 2:
Japanese: 文化の違いは面白い。
Romaji: Bunka no chigai wa omoshiroi.
English: Cultural differences are interesting.

Example 3:
Japanese: 味の違いがわかりますか？
Romaji: Aji no chigai ga wakarimasu ka?
English: Can you tell the difference in taste?

Yuka

So if I want to say “the difference between A and B,” I should use 違い?

Rei

Exactly! “AとBの違い” is the natural pattern. You are naming the difference as a concept, so the noun form is correct.

Chigau (違う) — The Verb Form

違う is a verb, and it has two related meanings. First, it means “to be different” — describing how two things diverge. Second, and very commonly, it means “to be wrong” — for example when correcting someone or denying a misunderstanding. This second use surprises many English learners.

Example 1:
Japanese: この二つの色は違う。
Romaji: Kono futatsu no iro wa chigau.
English: These two colors are different.

Example 2:
Japanese: それは違う！私が言ったのはそういう意味じゃない。
Romaji: Sore wa chigau! Watashi ga itta no wa sou iu imi ja nai.
English: That’s not right! That’s not what I meant.

Example 3:
Japanese: 彼女の考え方は私とは違う。
Romaji: Kanojo no kangaekata wa watashi to wa chigau.
English: Her way of thinking is different from mine.

Yuka

Can I use 違う to say “You’re wrong”?

Rei

Yes! Saying “違う！” alone is a very common, direct way to say “That’s wrong!” or “No, that’s not it!” Just be careful — it can sound sharp, so in polite company you might soften it to “違います” or “ちょっと違いますね.”

Common Mistakes

Side-by-Side Comparison

Conjugation of Chigau

違う is a u-verb (godan verb). Here are its key conjugated forms:

Decision Flowchart

Do you need a NOUN (a thing you can point to or describe)?
  YES --> Use 違い (chigai)
    Examples: 違いを見つける / 違いがある / AとBの違い
  NO
   |
   v
Do you need a VERB (an action or state in a predicate)?
  YES --> Use 違う (chigau)
    Examples: これは違う / 考え方が違う / 違います！
  UNSURE
   |
   v
Try replacing with English:
  "a difference" --> 違い
  "to be different / to be wrong" --> 違う

Quick Quiz

Yuka

OK, let’s practice! Fill in 違い or 違う.

Rei

Think about whether you need a noun or a verb in each sentence!

Q1. 二人の意見の___は何ですか？
A: 違い — “difference” is a noun here.

Q2. それは___！正しくありません。
A: 違う — verb, meaning “That’s wrong!”

Q3. 日本語と英語はとても___。
A: 違う — verb predicate meaning “are very different.”

Q4. 二つの商品の___を比べましょう。
A: 違い — noun, “Let’s compare the differences.”

Q5. 私の考えとあなたの考えは___と思う。
A: 違う — verb predicate in the clause.

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