monarchy vs autarchy

monarchy and autarchy both are nouns.

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

As nouns, autarchy is a hypernym of monarchy; that is, autarchy is a word with a broader meaning than monarchy:

monarchy: an autocracy governed by a monarch who usually inherits the authority
autarchy: a political system governed by a single individual

Other hypernyms of monarchy include autocracy.

monarchy (noun)	autarchy (noun)
an autocracy governed by a monarch who usually inherits the authority	a political system governed by a single individual
	economic independence as a national policy