painting vs fresco

painting and fresco both are nouns.

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

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

painting: creating a picture with paints
fresco: a durable method of painting on a wall by using watercolors on wet plaster

painting (noun)	fresco (noun)
creating a picture with paints	a durable method of painting on a wall by using watercolors on wet plaster
the occupation of a house painter	a mural done with watercolors on wet plaster
the act of applying paint to a surface
graphic art consisting of an artistic composition made by applying paints to a surface

painting (verb)	fresco (verb)
	paint onto wet plaster on a wall