fluidness vs fluid

fluidness and fluid both are nouns.

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

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

fluidness (adjective)	fluid (adjective)
	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)