autarchy vs autarchical

autarchy is a noun but autarchical is not a noun.

Word	Noun	Adjective	Verb	Adverb
autarchy	Yes	No	No	No
autarchical	No	Yes	No	No

autarchy (noun)	autarchical (noun)
a political system governed by a single individual
economic independence as a national policy

autarchy (adjective)	autarchical (adjective)
	of or relating to or characterized by autarchy