corroborate vs underpin

corroborate and underpin both are verbs.

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

As verbs, corroborate and underpin are synonyms defined as:

corroborate and underpin: support with evidence or authority or make more certain or confirm

Other synonyms of corroborate include bear out, support.

corroborate (verb)	underpin (verb)
establish or strengthen as with new evidence or facts	support from beneath
give evidence for	support with evidence or authority or make more certain or confirm
support with evidence or authority or make more certain or confirm