controvert vs blackball

controvert is not a noun while blackball is a noun.

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

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

Other hyponyms of controvert include negative, veto, dissent, protest, resist.

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

controvert (verb)	blackball (verb)
prove to be false or incorrect	expel from a community or group
be resistant to	vote against; refuse to endorse; refuse to assent