backing vs championship

backing and championship both are nouns.

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

As nouns, backing and championship are synonyms defined as:

Other synonyms of backing include backup, patronage.

backing (noun)	championship (noun)
the act of providing approval and support	the act of providing approval and support
something forming a back that is added for strengthening	a competition at which a champion is chosen
financial resources provided to make some project possible	the status of being a champion