natality vs birth rate

natality and birth rate both are nouns.

Word	Noun	Adjective	Verb	Adverb
natality	Yes	No	No	No
birth rate	Yes	No	No	No

As nouns, natality and birth rate are synonyms defined as:

natality and birth rate: the ratio of live births in an area to the population of that area; expressed per 1000 population per year

Other synonyms of natality include birthrate, fertility, fertility rate.

natality (noun)	birth rate (noun)
the ratio of live births in an area to the population of that area; expressed per 1000 population per year	the ratio of live births in an area to the population of that area; expressed per 1000 population per year