acceleration vs quickening

acceleration and quickening both are nouns.

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

As nouns, acceleration and quickening are synonyms defined as:

acceleration and quickening: the act of accelerating; increasing the speed

Other synonyms of acceleration include speedup.

acceleration (noun)	quickening (noun)
the act of accelerating; increasing the speed	the act of accelerating; increasing the speed
an increase in rate of change	the process of showing signs of life
(physics) a rate of increase of velocity	the stage of pregnancy at which the mother first feels the movements of the fetus