offerer vs benefactor

offerer and benefactor both are nouns.

Word	Noun	Adjective	Verb	Adverb
offerer	Yes	No	No	No
benefactor	Yes	No	No	No

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

offerer: someone who presents something to another for acceptance or rejection
benefactor: a person who helps people or institutions (especially with financial help)

Other hypernyms of offerer include helper.

offerer (noun)	benefactor (noun)
someone who presents something to another for acceptance or rejection	a person who helps people or institutions (especially with financial help)