fetor vs olfactory perception

fetor and olfactory perception both are nouns.

Word	Noun	Adjective	Verb	Adverb
fetor	Yes	No	No	No
olfactory perception	Yes	No	No	No

As nouns, olfactory perception is a hypernym of fetor; that is, olfactory perception is a word with a broader meaning than fetor:

fetor: a distinctive odor that is offensively unpleasant
olfactory perception: the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form

Other hypernyms of fetor include odor, odour, olfactory sensation, smell.

fetor (noun)	olfactory perception (noun)
a distinctive odor that is offensively unpleasant	the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form