plank vs plonk

plank and plonk both are nouns.

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

As verbs, plank and plonk are synonyms defined as:

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

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

plank (noun)	plonk (noun)
an endorsed policy in the platform of a political party	the noise of something dropping (as into liquid)
a stout length of sawn timber; made in a wide variety of sizes and used for many purposes	a cheap wine of inferior quality

plank (verb)	plonk (verb)
cook and serve on a plank	set (something or oneself) down with or as if with a noise
cover with planks
set (something or oneself) down with or as if with a noise