Other hyponyms of talker include
alliterator,
caller,
phoner,
telephoner,
babbler,
chatterbox,
chatterer,
magpie,
prater,
spouter,
conversationalist,
conversationist,
schmoozer,
dictator,
drawler,
driveller,
jabberer,
ejaculator,
growler,
asker,
enquirer,
inquirer,
querier,
questioner,
lecturer,
lisper,
mentioner,
motormouth,
mumbler,
murmurer,
mutterer,
narrator,
storyteller,
teller,
orator,
public speaker,
rhetorician,
speechifier,
speechmaker,
prattler,
ranter,
raver,
reciter,
native speaker,
stammerer,
stutterer,
stentor,
talking head,
venter,
vociferator,
voicer,
wailer,
whisperer,
informant,
witness,
witnesser.