olfactory sensation vs odour

olfactory sensation and odour both are nouns.

Word	Noun	Adjective	Verb	Adverb
olfactory sensation	Yes	No	No	No
odour	Yes	No	No	No

As nouns, olfactory sensation and odour are synonyms defined as:

olfactory sensation and odour: the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form

Other synonyms of olfactory sensation include odor, olfactory perception, smell.

olfactory sensation (noun)	odour (noun)
the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form	any property detected by the olfactory system
	the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form