helper vs assistant

helper and assistant both are nouns.

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

As nouns, helper and assistant are synonyms defined as:

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

Other synonyms of helper include help, supporter.

helper (noun)	assistant (noun)
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
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

helper (adjective)	assistant (adjective)
	of or relating to a person who is subordinate to another