plop vs plonk

plop and plonk both are nouns.

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

As verbs, plop and plonk are synonyms defined as:

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

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

plop (noun)	plonk (noun)
the noise of a rounded object dropping into a liquid without a splash	the noise of something dropping (as into liquid)
	a cheap wine of inferior quality

plop (verb)	plonk (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
drop something with a plopping sound

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