championship vs backing

championship and backing both are nouns.

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

As nouns, championship and backing are synonyms defined as:

Other synonyms of championship include backup, patronage.

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