validate vs substantiate

validate and substantiate both are verbs.

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

As verbs, substantiate is a hypernym of validate; that is, substantiate is a word with a broader meaning than validate:

Other hypernyms of validate include affirm, confirm, corroborate, support, sustain.

validate (verb)	substantiate (verb)
make valid or confirm the validity of	solidify, firm, or strengthen
prove valid; show or confirm the validity of something	establish or strengthen as with new evidence or facts
give evidence for	make real or concrete; give reality or substance to
declare or make legally valid	represent in bodily form