infant mortality vs infant deathrate

infant mortality and infant deathrate both are nouns.

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

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

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

Other synonyms of infant mortality include infant mortality rate.

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