converge vs convergence

converge is not a noun while convergence is a noun.

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

converge (noun)	convergence (noun)
	the act of converging (coming closer)
	the approach of an infinite series to a finite limit
	a representation of common ground between theories or phenomena
	the occurrence of two or more things coming together

converge (verb)	convergence (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