liquid vs fluid

liquid and fluid both are nouns.

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

As adjectives, liquid and fluid are synonyms defined as:

As adjectives, liquid and fluid are synonyms defined as:

Other synonyms of liquid include fluent, smooth.

As nouns, fluid is a hypernym of liquid; that is, fluid is a word with a broader meaning than liquid:

liquid: fluid matter having no fixed shape but a fixed volume
fluid: continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas

As nouns, fluid is a hypernym of liquid; that is, fluid is a word with a broader meaning than liquid:

liquid (noun)	fluid (noun)
a frictionless continuant that is not a nasal consonant (especially `l' and `r')	continuous amorphous matter that tends to flow and to conform to the outline of its container: a liquid or a gas
the state in which a substance exhibits a characteristic readiness to flow with little or no tendency to disperse and relatively high incompressibility	a substance that is fluid at room temperature and pressure
fluid matter having no fixed shape but a fixed volume
a substance that is liquid at room temperature and pressure

liquid (adjective)	fluid (adjective)
existing as or having characteristics of a liquid; especially tending to flow	subject to change; variable
changed from a solid to a liquid state	in cash or easily convertible to cash
clear and bright	smooth and unconstrained in movement
in cash or easily convertible to cash	characteristic of a fluid; capable of flowing and easily changing shape
smooth and unconstrained in movement	affording change (especially in social status)
smooth and flowing in quality; entirely free of harshness
filled or brimming with tears