OR vs operating room

OR and operating room both are nouns.

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

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

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

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

OR (noun)	operating room (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