deathrate vs death rate

deathrate and death rate both are nouns.

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

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

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

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

deathrate (noun)	death 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