fetor vs malodour

fetor and malodour both are nouns.

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

As nouns, fetor and malodour are synonyms defined as:

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

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