sense of smell vs olfaction

sense of smell and olfaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
sense of smell	Yes	No	No	No
olfaction	Yes	No	No	No

As nouns, sense of smell and olfaction are synonyms defined as:

sense of smell and olfaction: the faculty that enables us to distinguish scents

Other synonyms of sense of smell include olfactory modality, smell.

sense of smell (noun)	olfaction (noun)
the faculty that enables us to distinguish scents	the faculty that enables us to distinguish scents