alteration vs alter

alteration is a noun but alter is not a noun.

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

alteration (noun)	alter (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

alteration (verb)	alter (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