flump vs plump down

flump and plump down both are verbs.

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

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

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

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

flump (verb)	plump down (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
fall heavily	drop heavily