alliterator vs talker

alliterator and talker both are nouns.

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

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

alliterator: a speaker or writer who makes use of alliteration
talker: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of alliterator include speaker, utterer, verbaliser, verbalizer, author, writer.

alliterator (noun)	talker (noun)
a speaker or writer who makes use of alliteration	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)