backup vs championship

backup and championship both are nouns.

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

As nouns, backup and championship are synonyms defined as:

Other synonyms of backup include backing, patronage.

backup (noun)	championship (noun)
the act of providing approval and support	the act of providing approval and support
(computer science) a copy of a file or directory on a separate storage device	a competition at which a champion is chosen
a musical part (vocal or instrumental) that supports or provides background for other musical parts	the status of being a champion
someone who takes the place of another (as when things get dangerous or difficult)
an accumulation caused by clogging or a stoppage