collapse vs flop

collapse and flop both are nouns.

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

As nouns, collapse and flop are synonyms defined as:

As verbs, flop is a hyponym of collapse; that is, flop is a word with a more specific, narrower meaning than collapse:

Other hyponyms of collapse include go off, implode, buckle, crumple, break, sink, slide down, slump.

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

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

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