infant mortality rate vs infant deathrate

infant mortality rate and infant deathrate both are nouns.

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

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

infant mortality rate and infant deathrate: the death rate during the first year of life

Other synonyms of infant mortality rate include infant mortality.

infant mortality rate (noun)	infant deathrate (noun)
the death rate during the first year of life	the death rate during the first year of life