modality vs olfaction

modality and olfaction both are nouns.

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

As nouns, olfaction is a hyponym of modality; that is, olfaction is a word with a more specific, narrower meaning than modality:

modality (noun)	olfaction (noun)
a method of therapy that involves physical or electrical therapeutic treatment	the faculty that enables us to distinguish scents
a particular sense
a classification of propositions on the basis of whether they claim necessity or possibility or impossibility
verb inflections that express how the action or state is conceived by the speaker