dictator vs shogun

dictator and shogun both are nouns.

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

As nouns, shogun is a hyponym of dictator; that is, shogun is a word with a more specific, narrower meaning than dictator:

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

Other hyponyms of dictator include strongman, autocrat, despot, tyrant.

dictator (noun)	shogun (noun)
a ruler who is unconstrained by law	a hereditary military dictator of Japan; the shoguns ruled Japan until the revolution of 1867-68
a person who behaves in a tyrannical manner
a speaker who dictates to a secretary or a recording machine