morning room vs sitting room

morning room and sitting room both are nouns.

Word	Noun	Adjective	Verb	Adverb
morning room	Yes	No	No	No
sitting room	Yes	No	No	No

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

morning room: a sitting room used during the daylight hours
sitting room: a room in a private house or establishment where people can sit and talk and relax

Other hypernyms of morning room include front room, living-room, living room, parlor, parlour.

morning room (noun)	sitting room (noun)
a sitting room used during the daylight hours	a room in a private house or establishment where people can sit and talk and relax