corroborate vs substantiate

corroborate and substantiate both are verbs.

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

As verbs, corroborate and substantiate are synonyms defined as:

corroborate and substantiate: establish or strengthen as with new evidence or facts

Other synonyms of corroborate include affirm, confirm, support, sustain.

corroborate (verb)	substantiate (verb)
establish or strengthen as with new evidence or facts	solidify, firm, or strengthen
give evidence for	establish or strengthen as with new evidence or facts
support with evidence or authority or make more certain or confirm	make real or concrete; give reality or substance to
	represent in bodily form