plummet vs plump

plummet and plump both are nouns.

Word	Noun	Adjective	Verb	Adverb
plummet	Yes	No	Yes	No
plump	Yes	Yes	Yes	Yes

As verbs, plummet and plump are synonyms defined as:

plummet (noun)	plump (noun)
the metal bob of a plumb line	the sound of a sudden heavy fall

plummet (adjective)	plump (adjective)
	sufficiently fat so as to have a pleasing fullness of figure

plummet (verb)	plump (verb)
drop sharply	give support (to) or make a choice (of) one out of a group or number
	make fat or plump
	set (something or oneself) down with or as if with a noise
	drop sharply

plummet (adverb)	plump (adverb)
	straight down especially heavily or abruptly