dictator vs dictatorial

dictator is a noun but dictatorial is not a noun.

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

dictator (noun)	dictatorial (noun)
a ruler who is unconstrained by law
a person who behaves in a tyrannical manner
a speaker who dictates to a secretary or a recording machine

dictator (adjective)	dictatorial (adjective)
	of or characteristic of a dictator
	expecting unquestioning obedience
	characteristic of an absolute ruler or absolute rule; having absolute sovereignty