alter vs alteration

alter is not a noun while alteration is a noun.

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

alter (noun)	alteration (noun)
	the act of revising or altering (involving reconsideration and modification)
	the act of making something different (as e.g. the size of a garment)
	an event that occurs when something passes from one state or phase to another

alter (verb)	alteration (verb)
remove the ovaries of
become different in some particular way, without permanently losing one's or its former characteristics or essence
cause to change; make different; cause a transformation
insert words into texts, often falsifying it thereby
make an alteration to