Practice JLPTHow 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 fear/risk that | N2 |
| かもしれない kamoshirenai | Might/Maybe | N4 |
恐れがある regaaru
There is a fear/risk that
It is feared (that); we fear (that); we are worried/concerned (that); there is a fear/risk/chance/concern/etc.; can; could; may; it is possible (that); be in danger of | A phrase that means “it is feared (that)"
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M社は自社の携帯電話のいくつかの機種に発熱の恐れがあると発表した。
Company M announced that there is a risk that some of their cell phone models may generate heat.
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ここのカフェテリアは食材が古い恐れがある。
The ingredients used (in the food) at this cafeteria may be old.
かもしれない kamoshirenai
Might/Maybe
Might | Can't tell if ~
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あの人は今日のパーティーのことを忘れたかもしれません。
He might have forgotten about today's party.
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あの先生の授業はつまらないかもしれない・かもしれません。
That teacher's class might be dull.
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 — meanings, usage and example sentences — so you can tell them apart.