corroborate vs sustain

corroborate and sustain both are verbs.

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

As verbs, corroborate and sustain are synonyms defined as:

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

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

corroborate (verb)	sustain (verb)
establish or strengthen as with new evidence or facts	undergo (as of injuries and illnesses)
give evidence for	establish or strengthen as with new evidence or facts
support with evidence or authority or make more certain or confirm	admit as valid
	supply with necessities and support
	provide with nourishment
	be the physical support of; carry the weight of
	lengthen or extend in duration or space