sweetness vs olfactory property

sweetness and olfactory property both are nouns.

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

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

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

sweetness (noun)	olfactory property (noun)
the property of tasting as if it contains sugar	any property detected by the olfactory system
a pleasingly sweet olfactory property
the quality of giving pleasure
the taste experience when sugar dissolves in the mouth