takeoff vs ascent

takeoff and ascent both are nouns.

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

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

Other hypernyms of takeoff include ascension, rise, rising.

takeoff (noun)	ascent (noun)
a departure; especially of airplanes	the act of changing location in an upward direction
humorous or satirical mimicry	a movement upward; rise above the ground
a composition that imitates or misrepresents somebody's style, usually in a humorous way	an upward slope or grade (as in a road)
the initial ascent of an airplane as it becomes airborne