rancidness vs odour

rancidness and odour both are nouns.

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

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

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

rancidness (noun)	odour (noun)
the property of being rancid	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