tyrannical vs autocratic

tyrannical and autocratic both are adjectives.

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

As adjectives, tyrannical and autocratic are synonyms defined as:

tyrannical and autocratic: characteristic of an absolute ruler or absolute rule; having absolute sovereignty

Other synonyms of tyrannical include authoritarian, despotic, dictatorial, tyrannic.

tyrannical (adjective)	autocratic (adjective)
marked by unjust severity or arbitrary behavior	offensively self-assured or given to exercising usually unwarranted power
characteristic of an absolute ruler or absolute rule; having absolute sovereignty	characteristic of an absolute ruler or absolute rule; having absolute sovereignty