financial support vs backing

financial support and backing both are nouns.

Word	Noun	Adjective	Verb	Adverb
financial support	Yes	No	No	No
backing	Yes	No	No	No

As nouns, financial support and backing are synonyms defined as:

financial support and backing: financial resources provided to make some project possible

Other synonyms of financial support include financial backing, funding, support.

financial support (noun)	backing (noun)
financial resources provided to make some project possible	the act of providing approval and support
	something forming a back that is added for strengthening
	financial resources provided to make some project possible