defeat vs expel

defeat is a noun but expel is not a noun.

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

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

defeat (noun)	expel (noun)
an unsuccessful ending to a struggle or contest
the feeling that accompanies an experience of being thwarted in attaining your goals

defeat (verb)	expel (verb)
win a victory over	eliminate (a substance)
thwart the passage of	cause to flee
	force to leave or move out
	remove from a position or office