hotel room vs sleeping room

hotel room and sleeping room both are nouns.

Word	Noun	Adjective	Verb	Adverb
hotel room	Yes	No	No	No
sleeping room	Yes	No	No	No

As nouns, sleeping room is a hypernym of hotel room; that is, sleeping room is a word with a broader meaning than hotel room:

Other hypernyms of hotel room include bedchamber, bedroom, chamber, sleeping accommodation.

hotel room (noun)	sleeping room (noun)
a bedroom (usually with bath) in a hotel	a room used primarily for sleeping