birth vs parentage

birth and parentage both are nouns.

Word	Noun	Adjective	Verb	Adverb
birth	Yes	No	Yes	No
parentage	Yes	No	No	No

As nouns, birth and parentage are synonyms defined as:

birth and parentage: the kinship relation of an offspring to the parents

birth (noun)	parentage (noun)
the event of being born	the hereditary derivation of an individual
a baby born; an offspring	the kinship relation of an offspring to the parents
the process of giving birth	the state of being a parent
the kinship relation of an offspring to the parents
the time when something begins (especially life)

birth (verb)	parentage (verb)
cause to be born