fatality rate vs mortality rate

fatality rate and mortality rate both are nouns.

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

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

fatality rate and mortality rate: 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.

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