converge vs convergency

converge is not a noun while convergency is a noun.

Word	Noun	Adjective	Verb	Adverb
converge	No	No	Yes	No
convergency	Yes	No	No	No

converge (noun)	convergency (noun)
	the act of converging (coming closer)
	the approach of an infinite series to a finite limit

converge (verb)	convergency (verb)
come together so as to form a single product
move or draw together at a certain location
be adjacent or come together
approach a limit as the number of terms increases without limit