demonstrate vs corroborate

demonstrate and corroborate both are verbs.

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

As verbs, corroborate is a hypernym of demonstrate; that is, corroborate is a word with a broader meaning than demonstrate:

demonstrate: establish the validity of something, as by an example, explanation or experiment
corroborate: establish or strengthen as with new evidence or facts

Other hypernyms of demonstrate include affirm, confirm, substantiate, support, sustain.

demonstrate (verb)	corroborate (verb)
establish the validity of something, as by an example, explanation or experiment	establish or strengthen as with new evidence or facts
provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes	give evidence for
give an exhibition of to an interested audience	support with evidence or authority or make more certain or confirm
march in protest; take part in a demonstration