confluence vs blending

confluence and blending both are nouns.

Word	Noun	Adjective	Verb	Adverb
confluence	Yes	No	No	No
blending	Yes	No	No	No

As nouns, blending is a hypernym of confluence; that is, blending is a word with a broader meaning than confluence:

Other hypernyms of confluence include blend.

confluence (noun)	blending (noun)
a flowing together	a gradation involving small or imperceptible differences between grades
a coming together of people	the act of blending components together thoroughly
a place where things merge or flow together (especially rivers)