embarkation vs going away

embarkation and going away both are nouns.

Word	Noun	Adjective	Verb	Adverb
embarkation	Yes	No	No	No
going away	Yes	No	No	No

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

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

Other hypernyms of embarkation include departure, going, leaving.

embarkation (noun)	going away (noun)
the act of passengers and crew getting aboard a ship or aircraft	the act of departing