plop vs flump

plop is a noun but flump is not a noun.

Word	Noun	Adjective	Verb	Adverb
plop	Yes	No	Yes	Yes
flump	No	No	Yes	No

As verbs, plop and flump are synonyms defined as:

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

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

plop (noun)	flump (noun)
the noise of a rounded object dropping into a liquid without a splash

plop (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 with the sound of something falling into water	fall heavily
drop something with a plopping sound

plop (adverb)	flump (adverb)
with a short hollow thud