convergency vs converging

convergency and converging both are nouns.

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

As nouns, convergency and converging are synonyms defined as:

Other synonyms of convergency include convergence.

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