dormitory room vs dorm room

dormitory room and dorm room both are nouns.

Word	Noun	Adjective	Verb	Adverb
dormitory room	Yes	No	No	No
dorm room	Yes	No	No	No

As nouns, dormitory room and dorm room are synonyms defined as:

dormitory room and dorm room: a large sleeping room containing several beds

Other synonyms of dormitory room include dormitory.

dormitory room (noun)	dorm room (noun)
a large sleeping room containing several beds	a large sleeping room containing several beds