backer vs angel

backer and angel both are nouns.

Word	Noun	Adjective	Verb	Adverb
backer	Yes	No	No	No
angel	Yes	No	No	No

As nouns, backer and angel are synonyms defined as:

backer and angel: someone who provides financial support for some venture

backer (noun)	angel (noun)
someone who provides financial support for some venture	spiritual being attendant upon God
	someone who provides financial support for some venture
	person of exceptional holiness