Fluid
Part of speech: noun
Definition: Any state of matter which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma
Part of speech: adjective
Definition: Of, or relating to fluid. In a state of flux; subject to change. Moving smoothly, or giving the impression of a liquid in motion. Convertible into cash.
Example sentence: For me the meaning of my work is much more fluid.
Changeable
Part of speech: adjective
Definition: Capable of being changed.Subject to sudden or frequent changes.
Example sentence: In fact men will fight for a superstition quite as quickly as for a living truth - often more so, since a superstition is so intangible you cannot get at it to refute it, but truth is a point of view, and so is changeable.