sweetness vs fragrancy

sweetness and fragrancy both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweetness	Yes	No	No	No
fragrancy	Yes	No	No	No

As nouns, sweetness and fragrancy are synonyms defined as:

Other synonyms of sweetness include bouquet, fragrance, redolence.

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