fertility rate vs natality

fertility rate and natality both are nouns.

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

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

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

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

fertility rate (noun)	natality (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