scaffold vs sustain

scaffold is a noun but sustain is not a noun.

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

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

Other hypernyms of scaffold include hold, hold up, support.

scaffold (noun)	sustain (noun)
a temporary arrangement erected around a building for convenience of workers
a platform from which criminals are executed (hanged or beheaded)

scaffold (verb)	sustain (verb)
provide with a scaffold for support	undergo (as of injuries and illnesses)
	establish or strengthen as with new evidence or facts
	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