mural vs painting

mural and painting both are nouns.

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

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

mural: a painting that is applied to a wall surface
painting: graphic art consisting of an artistic composition made by applying paints to a surface

Other hypernyms of mural include picture.

mural (noun)	painting (noun)
a painting that is applied to a wall surface	creating a picture with paints
	the occupation of a house painter
	the act of applying paint to a surface
	graphic art consisting of an artistic composition made by applying paints to a surface

mural (adjective)	painting (adjective)
of or relating to walls