variable vs quantity

quantity vs variable

variable and quantity both are nouns.

variable is an adjective but quantity is not an adjective.

Word	Noun	Adjective	Verb	Adverb
variable	Yes	Yes	No	No
quantity	Yes	No	No	No

As nouns, quantity is a hypernym of variable; that is, quantity is a word with a broader meaning than variable:

variable: a quantity that can assume any of a set of values
quantity: the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable

variable (noun)	quantity (noun)
a quantity that can assume any of a set of values	how much there is or how many there are of something that you can quantify
a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity	an adequate or large amount
something that is likely to vary; something that is subject to variation	the concept that something has a magnitude and can be represented in mathematical expressions by a constant or a variable
a star that varies noticeably in brightness

variable (adjective)	quantity (adjective)
liable to or capable of change
(used of a device) designed so that a property (as e.g. light) can be varied
marked by diversity or difference

Difference between variable and quantity

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