olfaction vs olfactory modality

olfaction and olfactory modality both are nouns.

Word	Noun	Adjective	Verb	Adverb
olfaction	Yes	No	No	No
olfactory modality	Yes	No	No	No

As nouns, olfaction and olfactory modality are synonyms defined as:

olfaction and olfactory modality: the faculty that enables us to distinguish scents

Other synonyms of olfaction include sense of smell, smell.

olfaction (noun)	olfactory modality (noun)
the faculty that enables us to distinguish scents	the faculty that enables us to distinguish scents