diverge vs divergency

diverge is not a noun while divergency is a noun.

Word	Noun	Adjective	Verb	Adverb
diverge	No	No	Yes	No
divergency	Yes	No	No	No

diverge (noun)	divergency (noun)
	the act of moving away in different direction from a common point
	an infinite series that has no limit

diverge (verb)	divergency (verb)
move or draw apart
extend in a different direction
be at variance with; be out of line with
have no limits as a mathematical series