foetor vs malodor

foetor and malodor both are nouns.

Word	Noun	Adjective	Verb	Adverb
foetor	Yes	No	No	No
malodor	Yes	No	No	No

As nouns, foetor and malodor are synonyms defined as:

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

foetor (noun)	malodor (noun)
a distinctive odor that is offensively unpleasant	a distinctive odor that is offensively unpleasant