overcome vs expel

overcome and expel both are verbs.

Word	Noun	Adjective	Verb	Adverb
overcome	No	No	Yes	No
expel	No	No	Yes	No

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

overcome (verb)	expel (verb)
get on top of; deal with successfully	eliminate (a substance)
overcome, usually through no fault or weakness of the person that is overcome	cause to flee
win a victory over	force to leave or move out
overcome, as with emotions or perceptual stimuli	remove from a position or office