fluid

nouns

a substance that is fluid at room temperature and pressure

fluid

is a type of (narrower)

the real physical matter of which a person or thing consists

"DNA is the substance of our genes"

continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas

fluid

is a type of (narrower)

that which has mass and occupies space

"physicists study both the nature of matter and the forces which govern it"

subject to change; variable

"a fluid situation fraught with uncertainty"; "everything was unstable following the coup"

fluid, unstable

is derived from

characteristic of a fluid; capable of flowing and easily changing shape

fluid, runny

is derived from

is derived from

smooth and unconstrained in movement

"a long, smooth stride"; "the fluid motion of a cat"; "the liquid grace of a ballerina"

fluent, fluid, liquid, smooth

in cash or easily convertible to cash

"liquid (or fluid) assets"

fluid, liquid

affording change (especially in social status)

"Britain is not a truly fluid society"; "upwardly mobile"

fluid, mobile