WordNet sense 1 (the general atmosphere of a place or situation and the effect that it has on people):

feel, feeling, flavor, look, spirit, tone, flavour

WordNet sense 2 (the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form):

odor, odour, olfactory perception, olfactory sensation

WordNet sense 3 (the faculty that enables us to distinguish scents):

olfaction, olfactory modality, sense of smell

WordNet sense 4 (any property detected by the olfactory system):

aroma, scent, olfactory property

WordNet sense 5 (the act of perceiving the odor of something):

smelling