rottenness vs morbidity

rottenness and morbidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
rottenness	Yes	No	No	No
morbidity	Yes	No	No	No

As nouns, morbidity is a hypernym of rottenness; that is, morbidity is a word with a broader meaning than rottenness:

Other hypernyms of rottenness include morbidness, unwholesomeness.

rottenness (noun)	morbidity (noun)
the quality of rotting and becoming putrid	the quality of being unhealthful and generally bad for you
in a state of progressive putrefaction	an abnormally gloomy or unhealthy state of mind
	the relative incidence of a particular disease