departure vs divergence

departure and divergence both are nouns.

Word	Noun	Adjective	Verb	Adverb
departure	Yes	No	No	No
divergence	Yes	No	No	No

As nouns, departure and divergence are synonyms defined as:

departure and divergence: a variation that deviates from the standard or norm

Other synonyms of departure include deviation, difference.

departure (noun)	divergence (noun)
the act of departing	the act of moving away in different direction from a common point
euphemistic expressions for death	a difference between conflicting facts or claims or opinions
a variation that deviates from the standard or norm	an infinite series that has no limit
	a variation that deviates from the standard or norm