departure vs withdrawal

departure and withdrawal both are nouns.

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

As nouns, withdrawal is a hyponym of departure; that is, withdrawal is a word with a more specific, narrower meaning than departure:

departure (noun)	withdrawal (noun)
the act of departing	the act of withdrawing
euphemistic expressions for death	formal separation from an alliance or federation
a variation that deviates from the standard or norm	the termination of drug taking
	the act of taking out money or other capital
	a method of birth control in which coitus is initiated but the penis is deliberately withdrawn before ejaculation
	the act of withdrawing blood, tumors, etc.
	the act of ceasing to participate in an activity
	a retraction of a previously held position
	avoiding emotional involvement