listen vs eavesdrop

listen and eavesdrop both are verbs.

Word	Noun	Adjective	Verb	Adverb
listen	No	No	Yes	No
eavesdrop	No	No	Yes	No

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

Other hyponyms of listen include hear out, listen in, advert, attend, give ear, hang, pay heed, hark, harken, hearken, listen in.

listen (verb)	eavesdrop (verb)
hear with intention	listen without the speaker's knowledge
listen and pay attention
pay close attention to; give heed to