collapse vs sustain

collapse is a noun but sustain is not a noun.

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

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

Other hypernyms of collapse include get, have, suffer.

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

Other hypernyms of collapse include get, have, suffer.

collapse (noun)	sustain (noun)
the act of throwing yourself down; collapse; sink
a natural event caused by something suddenly falling down or caving in
a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
an abrupt failure of function or complete physical exhaustion

collapse (verb)	sustain (verb)
collapse due to fatigue, an illness, or a sudden attack	undergo (as of injuries and illnesses)
lose significance, effectiveness, or value	establish or strengthen as with new evidence or facts
suffer a nervous breakdown	admit as valid
break down, literally or metaphorically	supply with necessities and support
fold or close up	provide with nourishment
fall apart	be the physical support of; carry the weight of
cause to burst	lengthen or extend in duration or space