veto vs contradict

veto is a noun but contradict is not a noun.

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

As verbs, contradict is a hypernym of veto; that is, contradict is a word with a broader meaning than veto:

Other hypernyms of veto include controvert, oppose.

veto (noun)	contradict (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)

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