variable vs unknown

unknown vs variable

variable and unknown both are nouns.

variable and unknown both are adjectives.

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

As nouns, unknown is a hyponym of variable; that is, unknown 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: a variable whose values are solutions of an equation

Other hyponyms of variable include placeholder, unknown quantity.

variable (noun)	unknown (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	an unknown and unexplored region
something that is likely to vary; something that is subject to variation	anyone who does not belong in the environment in which they are found
a star that varies noticeably in brightness

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

Difference between variable and unknown

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