birth vs doer

birth and doer both are nouns.

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

As nouns, doer is a hypernym of birth; that is, doer is a word with a broader meaning than birth:

Other hypernyms of birth include actor, worker.

birth (noun)	doer (noun)
the event of being born	a person who acts and gets things done
a baby born; an offspring
the process of giving birth
the kinship relation of an offspring to the parents
the time when something begins (especially life)

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