fluid vs liquid

fluid and liquid both are nouns.

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

As adjectives, fluid and liquid are synonyms defined as:

As adjectives, fluid and liquid are synonyms defined as:

Other synonyms of fluid include fluent, smooth.

As nouns, liquid is a hyponym of fluid; that is, liquid is a word with a more specific, narrower meaning than fluid:

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

Other hyponyms of fluid include gas.

As nouns, liquid is a hyponym of fluid; that is, liquid is a word with a more specific, narrower meaning than fluid:

Other hyponyms of fluid include coolant, filtrate, ichor.

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

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