OR vs operating theater

OR and operating theater both are nouns.

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

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

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

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

OR (noun)	operating theater (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