good Samaritan vs benefactor

good Samaritan and benefactor both are nouns.

Word	Noun	Adjective	Verb	Adverb
good Samaritan	Yes	No	No	No
benefactor	Yes	No	No	No

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

good Samaritan: a person who voluntarily offers help or sympathy in times of trouble
benefactor: a person who helps people or institutions (especially with financial help)

Other hypernyms of good Samaritan include helper.

good Samaritan (noun)	benefactor (noun)
a person who voluntarily offers help or sympathy in times of trouble	a person who helps people or institutions (especially with financial help)