theater of operations vs theatre

theater of operations and theatre both are nouns.

Word	Noun	Adjective	Verb	Adverb
theater of operations	Yes	No	No	No
theatre	Yes	No	No	No

As nouns, theater of operations and theatre are synonyms defined as:

theater of operations and theatre: a region in which active military operations are in progress

Other synonyms of theater of operations include field, field of operations, theater, theatre of operations.

theater of operations (noun)	theatre (noun)
a region in which active military operations are in progress	a building where theatrical performances or motion-picture shows can be presented
	the art of writing and producing plays
	a region in which active military operations are in progress