parenthood vs adulthood

parenthood and adulthood both are nouns.

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

As nouns, adulthood is a hypernym of parenthood; that is, adulthood is a word with a broader meaning than parenthood:

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

parenthood (noun)	adulthood (noun)
the state of being a parent	the state (and responsibilities) of a person who has attained maturity
	the period of time in your life after your physical growth has stopped and you are fully developed