helper vs benefactor

helper and benefactor both are nouns.

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

As nouns, helper and benefactor are synonyms defined as:

helper and benefactor: a person who helps people or institutions (especially with financial help)

helper (noun)	benefactor (noun)
a person who helps people or institutions (especially with financial help)	a person who helps people or institutions (especially with financial help)
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose