convergent vs convergence

convergent is not a noun while convergence is a noun.

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

convergent (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

convergent (adjective)	convergence (adjective)
tending to come together from different directions