parlour vs salon

parlour and salon both are nouns.

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

As nouns, salon is a hyponym of parlour; that is, salon 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
salon: elegant sitting room where guests are received

Other hyponyms of parlour include common room, morning room.

parlour (noun)	salon (noun)
reception room in an inn or club where visitors can be received	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