do-gooder vs benefactor

do-gooder and benefactor both are nouns.

Word	Noun	Adjective	Verb	Adverb
do-gooder	Yes	No	No	No
benefactor	Yes	No	No	No

As nouns, benefactor is a hypernym of do-gooder; that is, benefactor is a word with a broader meaning than do-gooder:

do-gooder: someone devoted to the promotion of human welfare and to social reforms
benefactor: a person who helps people or institutions (especially with financial help)

Other hypernyms of do-gooder include helper.

do-gooder (noun)	benefactor (noun)
someone devoted to the promotion of human welfare and to social reforms	a person who helps people or institutions (especially with financial help)