odour vs olfactory property

odour and olfactory property both are nouns.

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

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

odour and olfactory property: any property detected by the olfactory system

Other synonyms of odour include aroma, odor, scent, smell.

odour (noun)	olfactory property (noun)
any property detected by the olfactory system	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