salon vs parlour

salon and parlour both are nouns.

Word	Noun	Adjective	Verb	Adverb
salon	Yes	No	No	No
parlour	Yes	No	No	No

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

salon: elegant sitting room where guests are received
parlour: 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, sitting room.

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