foetor vs malodour

foetor and malodour both are nouns.

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

As nouns, foetor and malodour are synonyms defined as:

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

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