deathrate vs mortality rate

deathrate and mortality rate both are nouns.

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

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

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

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

deathrate (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