mephitis vs fetor

mephitis and fetor both are nouns.

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

As nouns, mephitis and fetor are synonyms defined as:

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

mephitis (noun)	fetor (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