deceleration vs alteration

deceleration and alteration both are nouns.

Word	Noun	Adjective	Verb	Adverb
deceleration	Yes	No	No	No
alteration	Yes	No	No	No

As nouns, alteration is a hypernym of deceleration; that is, alteration is a word with a broader meaning than deceleration:

deceleration: a decrease in rate of change
alteration: an event that occurs when something passes from one state or phase to another

Other hypernyms of deceleration include change, modification.

deceleration (noun)	alteration (noun)
the act of decelerating; decreasing the speed	the act of revising or altering (involving reconsideration and modification)
a decrease in rate of change	the act of making something different (as e.g. the size of a garment)
(physics) a rate of decrease in velocity	an event that occurs when something passes from one state or phase to another