adulthood vs parentage

adulthood and parentage both are nouns.

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

As nouns, parentage is a hyponym of adulthood; that is, parentage is a word with a more specific, narrower meaning than adulthood:

adulthood: the state (and responsibilities) of a person who has attained maturity
parentage: the state of being a parent

Other hyponyms of adulthood include manhood, parenthood, muliebrity, womanhood.

adulthood (noun)	parentage (noun)
the state (and responsibilities) of a person who has attained maturity	the hereditary derivation of an individual
the period of time in your life after your physical growth has stopped and you are fully developed	the kinship relation of an offspring to the parents
	the state of being a parent