dinner theater vs dinner theatre

dinner theater and dinner theatre both are nouns.

Word	Noun	Adjective	Verb	Adverb
dinner theater	Yes	No	No	No
dinner theatre	Yes	No	No	No

As nouns, dinner theater and dinner theatre are synonyms defined as:

dinner theater and dinner theatre: a theater at which dinner is included in the price of admission

dinner theater (noun)	dinner theatre (noun)
a theater at which dinner is included in the price of admission	a theater at which dinner is included in the price of admission