changeful vs fluid

changeful is not a noun while fluid is a noun.

Word	Noun	Adjective	Verb	Adverb
changeful	No	Yes	No	No
fluid	Yes	Yes	No	No

changeful (noun)	fluid (noun)
	continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
	a substance that is fluid at room temperature and pressure

changeful (adjective)	fluid (adjective)
such that alteration is possible; having a marked tendency to change	subject to change; variable
	in cash or easily convertible to cash
	smooth and unconstrained in movement
	characteristic of a fluid; capable of flowing and easily changing shape
	affording change (especially in social status)