fluid vs changeable

fluid is a noun but changeable is not a noun.

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

fluid (noun)	changeable (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

fluid (adjective)	changeable (adjective)
subject to change; variable	such that alteration is possible; having a marked tendency to change
in cash or easily convertible to cash	capable of or tending to change in form or quality or nature
smooth and unconstrained in movement	varying in color when seen in different lights or from different angles
characteristic of a fluid; capable of flowing and easily changing shape	subject to change
affording change (especially in social status)