blackball vs veto

blackball and veto both are nouns.

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

As verbs, blackball and veto are synonyms defined as:

Other synonyms of blackball include negative.

blackball (noun)	veto (noun)
the act of excluding someone by a negative vote or veto	a vote that blocks a decision
	the power or right to prohibit or reject a proposed or intended act (especially the power of a chief executive to reject a bill passed by the legislature)

blackball (verb)	veto (verb)
expel from a community or group	command against
vote against; refuse to endorse; refuse to assent	vote against; refuse to endorse; refuse to assent