championship vs backup

championship and backup both are nouns.

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

As nouns, championship and backup are synonyms defined as:

Other synonyms of championship include backing, patronage.

championship (noun)	backup (noun)
the act of providing approval and support	the act of providing approval and support
a competition at which a champion is chosen	(computer science) a copy of a file or directory on a separate storage device
the status of being a champion	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