prompter vs helper

prompter and helper both are nouns.

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

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

prompter: someone who assists a performer by providing the next words of a forgotten speech
helper: a person who contributes to the fulfillment of a need or furtherance of an effort or purpose

Other hypernyms of prompter include assistant, help, supporter.

prompter (noun)	helper (noun)
a device that displays words for people to read	a person who helps people or institutions (especially with financial help)
someone who assists a performer by providing the next words of a forgotten speech	a person who contributes to the fulfillment of a need or furtherance of an effort or purpose