unknown quantity vs variable

variable vs unknown quantity

unknown quantity and variable both are nouns.

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

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

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

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

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

unknown quantity (adjective)	variable (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 unknown quantity and variable

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