tyrannical vs tyranny

tyrannical is not a noun while tyranny is a noun.

Word	Noun	Adjective	Verb	Adverb
tyrannical	No	Yes	No	No
tyranny	Yes	No	No	No

tyrannical (noun)	tyranny (noun)
	a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.)
	dominance through threat of punishment and violence

tyrannical (adjective)	tyranny (adjective)
marked by unjust severity or arbitrary behavior
characteristic of an absolute ruler or absolute rule; having absolute sovereignty