plonk vs plop

plonk and plop both are nouns.

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

As verbs, plonk and plop are synonyms defined as:

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

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

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

plonk (verb)	plop (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

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