flop vs founder

flop and founder both are nouns.

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

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

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

As verbs, flop and founder are synonyms defined as:

Other synonyms of flop include fall flat, fall through.

flop (noun)	founder (noun)
the act of throwing yourself down; collapse; sink	a person who founds or establishes some institution
a complete failure	a worker who makes metal castings
someone who is unsuccessful	inflammation of the laminated tissue that attaches the hoof to the foot of a horse
an arithmetic operation performed on floating-point numbers

flop (verb)	founder (verb)
fall suddenly and abruptly	break down, literally or metaphorically
fall loosely	sink below the surface
fail utterly; collapse	stumble and nearly fall
	fail utterly; collapse

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