motel room vs sleeping room

motel room and sleeping room both are nouns.

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

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

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

motel room (noun)	sleeping room (noun)
a sleeping room in a motel	a room used primarily for sleeping