acceleration vs speedup

acceleration and speedup both are nouns.

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

As nouns, acceleration and speedup are synonyms defined as:

Other synonyms of acceleration include quickening.

acceleration (noun)	speedup (noun)
the act of accelerating; increasing the speed	the act of accelerating; increasing the speed
an increase in rate of change
(physics) a rate of increase of velocity