paint vs watercolour

paint and watercolour both are nouns.

Word	Noun	Adjective	Verb	Adverb
paint	Yes	No	Yes	No
watercolour	Yes	No	Yes	No

As verbs, watercolour is a hyponym of paint; that is, watercolour is a word with a more specific, narrower meaning than paint:

Other hyponyms of paint include finger-paint, stipple, bodypaint, fresco, distemper, charge, fill in, shade, stipple, watercolor.

paint (noun)	watercolour (noun)
a substance used as a coating to protect or decorate a surface (especially a mixture of pigment suspended in a liquid); dries to form a hard coating	the art or technique of painting with watercolors
makeup consisting of a pink or red powder applied to the cheeks	a painting produced with watercolors
(basketball) a space (including the foul line) in front of the basket at each end of a basketball court; usually painted a different color from the rest of the court	a water-base paint (with water-soluble pigments); used by artists
	water-soluble pigment

paint (verb)	watercolour (verb)
apply paint to; coat with paint	paint with watercolors
apply a liquid to; e.g., paint the gutters with linseed oil
make a painting of
make a painting