parlour vs morning room

parlour and morning room both are nouns.

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

As nouns, morning room is a hyponym of parlour; that is, morning room is a word with a more specific, narrower meaning than parlour:

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

Other hyponyms of parlour include common room, salon.

parlour (noun)	morning room (noun)
reception room in an inn or club where visitors can be received	a sitting room used during the daylight hours
a room in a private house or establishment where people can sit and talk and relax