How to tell them apart
The core contrast is that 恐れがある conveys a genuine concern about an undesirable outcome, typically used in formal or public contexts like product warnings or safety announcements, while かもしれない simply states uncertainty without any negative connotation. Swapping them feels unnatural: saying 携帯電話が発熱するかもしれない sounds too casual for a company announcement, while 忘れた恐れがある overstates a mundane possibility as a serious risk. 恐れがある is almost always tied to bad outcomes, whereas かもしれない is neutral and works for any possibility, good or bad.
- 恐れがある Use 恐れがある when expressing concern about a negative or risky outcome, especially in formal or public contexts.
- かもしれない Use かもしれない when simply stating that something might be true, with no implication of risk or concern.
| Grammar point | Meaning | JLPT level |
|---|---|---|
| 恐れがある regaaru | there is a danger/risk that | N2 |
| かもしれない kamoshirenai | might; possibly; perhaps | N4 |
恐れがある regaaru
there is a danger/risk that
恐れがある expresses that there is a risk or danger of something undesirable happening. It follows a plain-form verb or a noun plus の, as in 割れる恐れがある or 絶滅の恐れがある. The tone is formal, so it suits written notices and serious statements.
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グラスに熱湯を入れると割れる恐れがあるので、入れないでください。
Don't pour hot water into a glass, or it may crack.
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警察に捕まるような恐れがあるのですか。
Is there any risk of being caught by the police?
かもしれない kamoshirenai
might; possibly; perhaps
かもしれない expresses that something is possible but uncertain, like English
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明日雨になるかもしれないがともかく私たちは出かけるつもりだ。
It may rain tomorrow, but we are going in any case.
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夜には雨になるかもしれない。
It may rain in the evening.
恐れがある and かもしれない are JLPT N4–N2 grammar points that Japanese learners often mix up. This page compares them side by side on meanings, usage and example sentences, so you can tell them apart.