dictator vs talker

dictator and talker both are nouns.

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

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

dictator: a speaker who dictates to a secretary or a recording machine
talker: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of dictator include speaker, utterer, verbaliser, verbalizer.

dictator (noun)	talker (noun)
a ruler who is unconstrained by law	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
a person who behaves in a tyrannical manner
a speaker who dictates to a secretary or a recording machine