autonomous vs autonomy

autonomous is not a noun while autonomy is a noun.

Word	Noun	Adjective	Verb	Adverb
autonomous	No	Yes	No	No
autonomy	Yes	No	No	No

autonomous (noun)	autonomy (noun)
	immunity from arbitrary exercise of authority: political independence
	personal independence

autonomous (adjective)	autonomy (adjective)
(of political bodies) not controlled by outside forces
(of persons) free from external control and constraint in e.g. action and judgment
existing as an independent entity