plump down vs flump

plump down and flump both are verbs.

Word	Noun	Adjective	Verb	Adverb
plump down	No	No	Yes	No
flump	No	No	Yes	No

As verbs, plump down and flump are synonyms defined as:

plump down and flump: set (something or oneself) down with or as if with a noise

Other synonyms of plump down include plank, plonk, plop, plump, plunk, plunk down.

plump down (verb)	flump (verb)
set (something or oneself) down with or as if with a noise	set (something or oneself) down with or as if with a noise
drop heavily	fall heavily