infant mortality vs deathrate

infant mortality and deathrate both are nouns.

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

As nouns, deathrate is a hypernym of infant mortality; that is, deathrate is a word with a broader meaning than infant mortality:

infant mortality: the death rate during the first year of life
deathrate: the ratio of deaths in an area to the population of that area; expressed per 1000 per year

Other hypernyms of infant mortality include death rate, fatality rate, mortality, mortality rate.

infant mortality (noun)	deathrate (noun)
the death rate during the first year of life	the ratio of deaths in an area to the population of that area; expressed per 1000 per year