belly flopper vs belly flop

belly flopper and belly flop both are nouns.

Word	Noun	Adjective	Verb	Adverb
belly flopper	Yes	No	No	No
belly flop	Yes	No	No	No

As nouns, belly flopper and belly flop are synonyms defined as:

belly flopper and belly flop: a dive in which the abdomen bears the main force of impact with the water

Other synonyms of belly flopper include belly whop, belly whopper.

belly flopper (noun)	belly flop (noun)
a dive in which the abdomen bears the main force of impact with the water	a dive in which the abdomen bears the main force of impact with the water