good Samaritan vs helper

good Samaritan and helper both are nouns.

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

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

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

Other hypernyms of good Samaritan include benefactor.

good Samaritan (noun)	helper (noun)
a person who voluntarily offers help or sympathy in times of trouble	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