vary vs negate

vary and negate both are verbs.

Word	Noun	Adjective	Verb	Adverb
vary	No	No	Yes	No
negate	No	No	Yes	No

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

Other hyponyms of vary include aberrate, aberrate, belie, contradict.

vary (verb)	negate (verb)
become different in some particular way, without permanently losing one's or its former characteristics or essence	make ineffective by counterbalancing the effect of
make something more diverse and varied	prove negative; show to be false
be at variance with; be out of line with	deny the truth of
be subject to change in accordance with a variable	be in contradiction with