salon vs art gallery

salon and art gallery both are nouns.

Word	Noun	Adjective	Verb	Adverb
salon	Yes	No	No	No
art gallery	Yes	No	No	No

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

Other hypernyms of salon include gallery, picture gallery.

salon (noun)	art gallery (noun)
elegant sitting room where guests are received	a room or series of rooms where works of art are exhibited
gallery where works of art can be displayed
a shop where hairdressers and beauticians work