finger-painting vs finger-paint

finger-painting is a noun but finger-paint is not a noun.

Word	Noun	Adjective	Verb	Adverb
finger-painting	Yes	No	No	No
finger-paint	No	No	Yes	No

finger-painting (noun)	finger-paint (noun)
painting by using the fingers to spread the paint
a painting produced by spreading paint with the fingers

finger-painting (verb)	finger-paint (verb)
	apply colors with one's fingers