photo wallpaper vs wallpaper

photo wallpaper and wallpaper both are nouns.

Word	Noun	Adjective	Verb	Adverb
photo wallpaper	Yes	No	No	No
wallpaper	Yes	No	Yes	No

As nouns, wallpaper is a hypernym of photo wallpaper; that is, wallpaper is a word with a broader meaning than photo wallpaper:

photo wallpaper: A decorative printed wallpaper usually placed on only one wall; the print can either be custom or chosen from a predefined set.
wallpaper: a decorative paper for the walls of rooms

photo wallpaper (noun)	wallpaper (noun)
A decorative printed wallpaper usually placed on only one wall; the print can either be custom or chosen from a predefined set.	a decorative paper for the walls of rooms

photo wallpaper (verb)	wallpaper (verb)
	cover with wallpaper