relative incidence vs frequency

relative incidence and frequency both are nouns.

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

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

relative incidence: the relative frequency of occurrence of something
frequency: the ratio of the number of observations in a statistical category to the total number of observations

Other hypernyms of relative incidence include relative frequency.

relative incidence (noun)	frequency (noun)
the relative frequency of occurrence of something	the number of observations in a given statistical category
	the ratio of the number of observations in a statistical category to the total number of observations
	the number of occurrences within a given time period