caregiver vs doer

caregiver and doer both are nouns.

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

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

caregiver: a person who is responsible for attending to the needs of a child or dependent adult
doer: a person who acts and gets things done

Other hypernyms of caregiver include actor, worker.

caregiver (noun)	doer (noun)
a person who is responsible for attending to the needs of a child or dependent adult	a person who acts and gets things done
a person who helps in identifying or preventing or treating illness or disability