uncle vs helper

uncle and helper both are nouns.

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

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

uncle: a source of help and advice and encouragement
helper: a person who helps people or institutions (especially with financial help)

Other hypernyms of uncle include benefactor.

uncle (noun)	helper (noun)
the brother of your father or mother; the husband of your aunt	a person who helps people or institutions (especially with financial help)
a source of help and advice and encouragement	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose