mortality rate vs deathrate

mortality rate and deathrate both are nouns.

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

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

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

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

mortality rate (noun)	deathrate (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