olfaction(n = noun.cognition) olfactory modality, sense of smell, smell - the faculty that enables us to distinguish scents;
is a kind of modality, sense modality, sensory system, exteroception
has particulars: nose

   The sense by which the impressions made on the olfactory organs by the odorous particles in the atmosphere are perceived. [1913 Webster]

olfaction, n. the act or capacity of smelling; the sense of smell.

Derivative:
olfactive adj.

Etymology:
L olfactus a smell f. olere to smell + facere fact- make

N  odor, smell, odorament, scent, effluvium, emanation, exhalation, fume, essence, trail, nidor, redolence, sense of smell, scent, act of smelling, olfaction, olfactories, fragrance, odorant, bloodhound, hound, spoor, odorous, odoriferous, smelling, reeking, foul-smelling, strong- scented, redolent, graveolent, nidorous, pungent, putrid, foul, olfactory, quick-scented.