unknown vs variable

variable vs unknown

unknown and variable both are nouns.

unknown and variable both are adjectives.

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

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

unknown: 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 (noun)	variable (noun)
a variable whose values are solutions of an equation	a quantity that can assume any of a set of values
an unknown and unexplored region	a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity
anyone who does not belong in the environment in which they are found	something that is likely to vary; something that is subject to variation
	a star that varies noticeably in brightness

unknown (adjective)	variable (adjective)
not known	liable to or capable of change
being or having an unknown or unnamed source	(used of a device) designed so that a property (as e.g. light) can be varied
not famous or acclaimed	marked by diversity or difference
not known before
not known to exist

Difference between unknown and variable

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