fragrancy vs odour

fragrancy and odour both are nouns.

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

As nouns, odour is a hypernym of fragrancy; that is, odour is a word with a broader meaning than fragrancy:

Other hypernyms of fragrancy include aroma, odor, olfactory property, scent, smell.

fragrancy (noun)	odour (noun)
a pleasingly sweet olfactory property	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