wash drawing vs watercolor

wash drawing and watercolor both are nouns.

Word	Noun	Adjective	Verb	Adverb
wash drawing	Yes	No	No	No
watercolor	Yes	No	Yes	No

As nouns, watercolor is a hypernym of wash drawing; that is, watercolor is a word with a broader meaning than wash drawing:

wash drawing: a watercolor made by applying a series of monochrome washes one over the other
watercolor: a painting produced with watercolors

Other hypernyms of wash drawing include water-color, water-colour, watercolour.

wash drawing (noun)	watercolor (noun)
a watercolor made by applying a series of monochrome washes one over the other	the art or technique of painting with watercolors
	a painting produced with watercolors
	a water-base paint (with water-soluble pigments); used by artists
	water-soluble pigment

wash drawing (verb)	watercolor (verb)
	paint with watercolors