shogun vs dictator

shogun and dictator both are nouns.

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

As nouns, dictator is a hypernym of shogun; that is, dictator is a word with a broader meaning than shogun:

shogun: a hereditary military dictator of Japan; the shoguns ruled Japan until the revolution of 1867-68
dictator: a ruler who is unconstrained by law

Other hypernyms of shogun include Japanese, Nipponese, potentate.

shogun (noun)	dictator (noun)
a hereditary military dictator of Japan; the shoguns ruled Japan until the revolution of 1867-68	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