morbidity vs relative incidence

morbidity and relative incidence both are nouns.

Word	Noun	Adjective	Verb	Adverb
morbidity	Yes	No	No	No
relative incidence	Yes	No	No	No

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

Other hypernyms of morbidity include incidence.

morbidity (noun)	relative incidence (noun)
the quality of being unhealthful and generally bad for you	the relative frequency of occurrence of something
an abnormally gloomy or unhealthy state of mind
the relative incidence of a particular disease