quickening vs speedup

quickening and speedup both are nouns.

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

As nouns, quickening and speedup are synonyms defined as:

Other synonyms of quickening include acceleration.

quickening (noun)	speedup (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