variable vs unknown quantity

unknown quantity vs variable

variable and unknown quantity both are nouns.

variable is an adjective but unknown quantity is not an adjective.

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

As nouns, unknown quantity is a hyponym of variable; that is, unknown quantity is a word with a more specific, narrower meaning than variable:

variable: a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
unknown quantity: a variable whose values are solutions of an equation

Other hyponyms of variable include placeholder, unknown.

variable (noun)	unknown quantity (noun)
a quantity that can assume any of a set of values	a variable whose values are solutions of an equation
a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity	a factor in a given situation whose bearing and importance is not apparent
something that is likely to vary; something that is subject to variation
a star that varies noticeably in brightness

variable (adjective)	unknown 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 unknown quantity

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