demonstrate vs negate

demonstrate and negate both are verbs.

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

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

demonstrate: establish the validity of something, as by an example, explanation or experiment
negate: prove negative; show to be false

Other hyponyms of demonstrate include prove oneself, prove, contradict, stultify.

demonstrate (verb)	negate (verb)
establish the validity of something, as by an example, explanation or experiment	make ineffective by counterbalancing the effect of
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes	prove negative; show to be false
give an exhibition of to an interested audience	deny the truth of
march in protest; take part in a demonstration	be in contradiction with