helper vs supporter

helper and supporter both are nouns.

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

As nouns, supporter is a hyponym of helper; that is, supporter is a word with a more specific, narrower meaning than helper:

helper: a person who helps people or institutions (especially with financial help)
supporter: someone who supports or champions something

As nouns, helper and supporter are synonyms defined as:

helper and supporter: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

Other synonyms of helper include assistant, help.

helper (noun)	supporter (noun)
a person who helps people or institutions (especially with financial help)	a band (usually elastic) worn around the leg to hold up a stocking (or around the arm to hold up a sleeve)
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose	a support for the genitals worn by men engaging in strenuous exercise
	a person who backs a politician or a team etc.
	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
	someone who supports or champions something