variable vs placeholder

placeholder vs variable

variable and placeholder both are nouns.

variable is an adjective but placeholder is not an adjective.

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

As nouns, placeholder is a hyponym of variable; that is, placeholder 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
placeholder: a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set

Other hyponyms of variable include unknown, unknown quantity.

variable (noun)	placeholder (noun)
a quantity that can assume any of a set of values	a symbol in a logical or mathematical expression that can be replaced by the name of any member of specified set
a symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity	a person authorized to act for another
something that is likely to vary; something that is subject to variation
a star that varies noticeably in brightness

variable (adjective)	placeholder (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 placeholder

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