mural wallpaper vs wallpaper

mural wallpaper and wallpaper both are nouns.

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

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

mural 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

mural 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

mural wallpaper (verb)	wallpaper (verb)
	cover with wallpaper