embarkation vs departure

embarkation and departure both are nouns.

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

As nouns, departure is a hypernym of embarkation; that is, departure is a word with a broader meaning than embarkation:

embarkation: the act of passengers and crew getting aboard a ship or aircraft
departure: the act of departing

Other hypernyms of embarkation include going, going away, leaving.

embarkation (noun)	departure (noun)
the act of passengers and crew getting aboard a ship or aircraft	the act of departing
	euphemistic expressions for death
	a variation that deviates from the standard or norm