blackball vs defeat

blackball and defeat both are nouns.

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

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

Other hyponyms of blackball include kill, shoot down, vote down, vote out.

blackball (noun)	defeat (noun)
the act of excluding someone by a negative vote or veto	an unsuccessful ending to a struggle or contest
	the feeling that accompanies an experience of being thwarted in attaining your goals

blackball (verb)	defeat (verb)
expel from a community or group	win a victory over
vote against; refuse to endorse; refuse to assent	thwart the passage of