alterable vs alter

alterable is an adjective but alter is not an adjective.

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

alterable (adjective)	alter (adjective)
capable of being changed or altered in some characteristic
(of the punishment ordered by a court) capable of being changed to one less severe

alterable (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