stink vs mephitis

stink and mephitis both are nouns.

Word	Noun	Adjective	Verb	Adverb
stink	Yes	No	Yes	No
mephitis	Yes	No	No	No

As nouns, stink and mephitis are synonyms defined as:

Other synonyms of stink include fetor, foetor, malodor, malodour, reek, stench.

stink (noun)	mephitis (noun)
a distinctive odor that is offensively unpleasant	a distinctive odor that is offensively unpleasant
	a poisonous or foul smelling gas emitted from the earth

stink (verb)	mephitis (verb)
smell badly and offensively
be extremely bad in quality or in one's performance