mannequin vs helper

mannequin and helper both are nouns.

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

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

mannequin: a woman who wears clothes to display fashions
helper: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

Other hypernyms of mannequin include assistant, help, supporter.

mannequin (noun)	helper (noun)
a life-size dummy used to display clothes	a person who helps people or institutions (especially with financial help)
a woman who wears clothes to display fashions	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose