contradict vs veto

contradict is not a noun while veto is a noun.

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

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

Other hyponyms of contradict include blackball, negative, dissent, protest, resist.

contradict (noun)	veto (noun)
	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)

contradict (verb)	veto (verb)
prove negative; show to be false	command against
deny the truth of	vote against; refuse to endorse; refuse to assent
be resistant to
be in contradiction with