fragrance vs olfactory property

fragrance and olfactory property both are nouns.

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

As nouns, olfactory property is a hypernym of fragrance; that is, olfactory property is a word with a broader meaning than fragrance:

Other hypernyms of fragrance include aroma, odor, odour, scent, smell.

fragrance (noun)	olfactory property (noun)
a pleasingly sweet olfactory property	any property detected by the olfactory system
a distinctive odor that is pleasant