monarchy vs autocracy

monarchy and autocracy both are nouns.

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

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

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

Other hypernyms of monarchy include autarchy.

monarchy (noun)	autocracy (noun)
an autocracy governed by a monarch who usually inherits the authority	a political theory favoring unlimited authority by a single individual
	a political system governed by a single individual