hear vs overhear

hear and overhear both are verbs.

Word	Noun	Adjective	Verb	Adverb
hear	No	No	Yes	No
overhear	No	No	Yes	No

As verbs, overhear is a hyponym of hear; that is, overhear is a word with a more specific, narrower meaning than hear:

Other hyponyms of hear include catch, take in, catch, get.

hear (verb)	overhear (verb)
get to know or become aware of, usually accidentally	hear, usually without the knowledge of the speakers
perceive (sound) via the auditory sense
receive a communication from someone
listen and pay attention
examine or hear (evidence or a case) by judicial process