olfactory impairment vs parosamia

olfactory impairment and parosamia both are nouns.

Word	Noun	Adjective	Verb	Adverb
olfactory impairment	Yes	No	No	No
parosamia	Yes	No	No	No

As nouns, olfactory impairment and parosamia are synonyms defined as:

Other synonyms of olfactory impairment include dysosmia.

olfactory impairment (noun)	parosamia (noun)
a disorder in the sense of smell	a disorder in the sense of smell