malodor vs foetor

malodor and foetor both are nouns.

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

As nouns, malodor and foetor are synonyms defined as:

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

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