OR vs operating theatre

OR and operating theatre both are nouns.

Word	Noun	Adjective	Verb	Adverb
OR	Yes	No	No	No
operating theatre	Yes	No	No	No

As nouns, OR and operating theatre are synonyms defined as:

OR and operating theatre: a room in a hospital equipped for the performance of surgical operations

Other synonyms of OR include operating room, operating theater, surgery.

OR (noun)	operating theatre (noun)
a room in a hospital equipped for the performance of surgical operations	a room in a hospital equipped for the performance of surgical operations
a state in northwestern United States on the Pacific with capital Salem