speedup vs quickening

speedup and quickening both are nouns.

Word	Noun	Adjective	Verb	Adverb
speedup	Yes	No	No	No
quickening	Yes	No	No	No

As nouns, speedup and quickening are synonyms defined as:

Other synonyms of speedup include acceleration.

speedup (noun)	quickening (noun)
the act of accelerating; increasing the speed	the act of accelerating; increasing the speed
	the process of showing signs of life
	the stage of pregnancy at which the mother first feels the movements of the fetus