sitting room vs salon

sitting room and salon both are nouns.

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

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

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

Other hyponyms of sitting room include common room, morning room.

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