takeoff vs departure

takeoff and departure both are nouns.

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

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

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

takeoff (noun)	departure (noun)
a departure; especially of airplanes	the act of departing
humorous or satirical mimicry	euphemistic expressions for death
a composition that imitates or misrepresents somebody's style, usually in a humorous way	a variation that deviates from the standard or norm
the initial ascent of an airplane as it becomes airborne