ranter vs talker

ranter and talker both are nouns.

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

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

ranter: someone who rants and raves; speaks in a violent or loud manner
talker: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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

ranter (noun)	talker (noun)
someone who rants and raves; speaks in a violent or loud manner	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)