flop vs collapse

flop and collapse both are nouns.

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

As nouns, flop and collapse are synonyms defined as:

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

Other hypernyms of flop include break, cave in, fall in, founder, give, give way.

flop (noun)	collapse (noun)
the act of throwing yourself down; collapse; sink	the act of throwing yourself down; collapse; sink
a complete failure	a natural event caused by something suddenly falling down or caving in
someone who is unsuccessful	a sudden large decline of business or the prices of stocks (especially one that causes additional failures)
an arithmetic operation performed on floating-point numbers	an abrupt failure of function or complete physical exhaustion

flop (verb)	collapse (verb)
fall suddenly and abruptly	collapse due to fatigue, an illness, or a sudden attack
fall loosely	lose significance, effectiveness, or value
fail utterly; collapse	suffer a nervous breakdown
	break down, literally or metaphorically
	fold or close up
	fall apart
	cause to burst

flop (adverb)	collapse (adverb)
with a flopping sound
completely