validate vs sustain

validate and sustain both are verbs.

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

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

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

validate (verb)	sustain (verb)
make valid or confirm the validity of	undergo (as of injuries and illnesses)
prove valid; show or confirm the validity of something	establish or strengthen as with new evidence or facts
give evidence for	admit as valid
declare or make legally 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