valid vs binding

valid is not a noun while binding is a noun.

Word	Noun	Adjective	Verb	Adverb
valid	No	Yes	No	No
binding	Yes	Yes	No	No

valid (noun)	binding (noun)
	the act of applying a bandage
	the protective covering on the front, back, and spine of a book
	strip sewn over or along an edge for reinforcement or decoration
	one of a pair of mechanical devices that are attached to a ski and that will grip a ski boot; the bindings should release in case of a fall
	the capacity to attract and hold something

valid (adjective)	binding (adjective)
well grounded in logic or truth or having legal force	executed with proper legal authority
still legally acceptable