liftoff vs ascension

liftoff and ascension both are nouns.

Word	Noun	Adjective	Verb	Adverb
liftoff	Yes	No	No	No
ascension	Yes	No	No	No

As nouns, ascension is a hypernym of liftoff; that is, ascension is a word with a broader meaning than liftoff:

Other hypernyms of liftoff include ascent, rise, rising.

liftoff (noun)	ascension (noun)
the initial ascent of a rocket from its launching pad	the act of changing location in an upward direction
	a movement upward; rise above the ground
	(astronomy) the rising of a star above the horizon