substitute vs backup

backup vs substitute

substitute and backup both are nouns.

substitute is an adjective but backup is not an adjective.

substitute is a verb but backup is not a verb.

Word	Noun	Adjective	Verb	Adverb
substitute	Yes	Yes	Yes	No
backup	Yes	No	No	No

As nouns, substitute and backup are synonyms defined as:

substitute and backup: someone who takes the place of another (as when things get dangerous or difficult)

Other synonyms of substitute include backup man, fill-in, relief, reliever, stand-in.

substitute (noun)	backup (noun)
a person or thing that takes or can take the place of another	the act of providing approval and support
someone who takes the place of another (as when things get dangerous or difficult)	(computer science) a copy of a file or directory on a separate storage device
an athlete who plays only when a starter on the team is replaced	a musical part (vocal or instrumental) that supports or provides background for other musical parts
	someone who takes the place of another (as when things get dangerous or difficult)
	an accumulation caused by clogging or a stoppage

substitute (adjective)	backup (adjective)
artificial and inferior
serving or used in place of another
capable of substituting in any of several positions on a team

substitute (verb)	backup (verb)
put in the place of another; switch seemingly equivalent items
be a substitute
act as a substitute

Difference between substitute and backup

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