picture gallery vs art gallery

picture gallery and art gallery both are nouns.

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

As nouns, picture gallery and art gallery are synonyms defined as:

picture gallery and art gallery: a room or series of rooms where works of art are exhibited

Other synonyms of picture gallery include gallery.

picture gallery (noun)	art gallery (noun)
a room or series of rooms where works of art are exhibited	a room or series of rooms where works of art are exhibited