tyrannical vs dictatorial

tyrannical and dictatorial both are adjectives.

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

As adjectives, tyrannical and dictatorial are synonyms defined as:

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

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

tyrannical (adjective)	dictatorial (adjective)
marked by unjust severity or arbitrary behavior	of or characteristic of a dictator
characteristic of an absolute ruler or absolute rule; having absolute sovereignty	expecting unquestioning obedience
	characteristic of an absolute ruler or absolute rule; having absolute sovereignty