blackball vs oppose

blackball is a noun but oppose is not a noun.

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

As verbs, oppose is a hypernym of blackball; that is, oppose is a word with a broader meaning than blackball:

Other hypernyms of blackball include contradict, controvert.

blackball (noun)	oppose (noun)
the act of excluding someone by a negative vote or veto

blackball (verb)	oppose (verb)
expel from a community or group	be resistant to
vote against; refuse to endorse; refuse to assent	be against; express opposition to
	set into opposition or rivalry
	fight against or resist strongly
	act against or in opposition to
	contrast with equal weight or force