gallery vs salon

gallery and salon both are nouns.

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

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

gallery (noun)	salon (noun)
narrow recessed balcony area along an upper floor on the interior of a building; usually marked by a colonnade	elegant sitting room where guests are received
a covered corridor (especially one extending along the wall of a building and supported with arches or columns)	gallery where works of art can be displayed
a long usually narrow room used for some specific purpose	a shop where hairdressers and beauticians work
a room or series of rooms where works of art are exhibited
a porch along the outside of a building (sometimes partly enclosed)
a horizontal (or nearly horizontal) passageway in a mine
spectators at a golf or tennis match