prompter vs theater prompter

prompter and theater prompter both are nouns.

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

As nouns, prompter and theater prompter are synonyms defined as:

prompter and theater prompter: someone who assists a performer by providing the next words of a forgotten speech

prompter (noun)	theater prompter (noun)
a device that displays words for people to read	someone who assists a performer by providing the next words of a forgotten speech
someone who assists a performer by providing the next words of a forgotten speech