mannikin vs helper

mannikin and helper both are nouns.

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

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

mannikin: 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 mannikin include assistant, help, supporter.

mannikin (noun)	helper (noun)
a life-size dummy used to display clothes	a person who helps people or institutions (especially with financial help)
a person who is very small but who is not otherwise deformed or abnormal	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose
a woman who wears clothes to display fashions