fatality rate vs mortality

fatality rate and mortality both are nouns.

Word	Noun	Adjective	Verb	Adverb
fatality rate	Yes	No	No	No
mortality	Yes	No	No	No

As nouns, fatality rate and mortality are synonyms defined as:

fatality rate and mortality: the ratio of deaths in an area to the population of that area; expressed per 1000 per year

Other synonyms of fatality rate include death rate, deathrate, mortality rate.

fatality rate (noun)	mortality (noun)
the ratio of deaths in an area to the population of that area; expressed per 1000 per year	the quality or state of being mortal
	the ratio of deaths in an area to the population of that area; expressed per 1000 per year