salon vs sitting room

salon and sitting room both are nouns.

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

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

salon: elegant sitting room where guests are received
sitting room: a room in a private house or establishment where people can sit and talk and relax

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

salon (noun)	sitting room (noun)
elegant sitting room where guests are received	a room in a private house or establishment where people can sit and talk and relax
gallery where works of art can be displayed
a shop where hairdressers and beauticians work