painting vs daub

painting and daub both are nouns.

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

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

painting: graphic art consisting of an artistic composition made by applying paints to a surface
daub: an unskillful painting

painting (noun)	daub (noun)
creating a picture with paints	an unskillful painting
the occupation of a house painter	a blemish made by dirt
the act of applying paint to a surface	material used to daub walls
graphic art consisting of an artistic composition made by applying paints to a surface

painting (verb)	daub (verb)
	cover (a surface) by smearing (a substance) over it
	coat with plaster
	apply to a surface