types:
alarmist
a person who alarms others needlessly
announcer
someone who proclaims a message publicly
avower
someone who admits or acknowledges openly and boldly
broadcaster
one that transmits messages on radio or television
conferrer
someone who converses or confers (as in a conference)
confessor
someone who confesses (discloses information damaging to themselves)
hisser
someone who communicates disapproval by hissing
presenter
someone who presents a message of some sort (as a petition or an address or a check or a memorial etc.)
promisee
a person to whom a promise is made
propagandist
a person who disseminates messages calculated to assist some cause or some government
quoter
a communicator (speaker or writer) who uses quotations
rambler
a person whose speech or writing is not well organized
signer
someone who can use sign language to communicate
swearer
someone who takes a solemn oath
twaddler
someone who twaddles; someone who writes or talks twaddle
waffler
someone who speaks or writes in a vague and evasive manner
warner
someone who gives a warning to others
waver
someone who communicates by waving
wirer
someone who sends a telegram
author,
writer
a person who writes (books or stories or articles or the like) professionally (for pay)
alliterator
a speaker or writer who makes use of alliteration
announcer
reads news, commercials on radio or television
bargainer
negotiator of the terms of a transaction
biographer
someone who writes an account of a person's life
caller
someone who proclaims or summons in a loud voice
cat
a spiteful woman gossip
compiler
a person who compiles information (as for reference purposes)
contributor
a writer whose work is published in a newspaper or magazine or as part of a book
crier
a peddler who shouts to advertise the goods he sells
cyberpunk
a writer of science fiction set in a lawless subculture of an oppressive society dominated by computer technology
framer
someone who writes a new law or plan
holdout
a negotiator who hopes to gain concessions by refusing to come to terms
leaker
a surreptitious informant
librettist
a writer who creates the scripts for operas and musicals
lobbyist
someone who is employed to persuade legislators to vote for legislation that favors the lobbyist's employer
muadhdhin,
muazzin,
muezzin
the Muslim official of a mosque who summons the faithful to prayer from a minaret five times a day
pamphleteer
a writer of pamphlets (usually taking a partisan stand on public issues)
paragrapher
a writer of paragraphs (as for publication on the editorial page of a newspaper)
passive source
an informant who is not assigned to obtain specific intelligence but who routinely passes on whatever information he or she has
poet
a writer of poems (the term is usually reserved for writers of good poetry)
postulator
someone who assumes or takes something for granted as the basis of an argument
scriptwriter
someone who writes scripts for plays or movies or broadcast dramas
settler
a negotiator who settles disputes
signalman
a railroad employee in charge of signals and point in a railroad yard
sloganeer
someone who coins and uses slogans to promote a cause
spammer
someone who sends unwanted email (often in bulk)
speechwriter
a writer who composes speeches for others to deliver
Svengali
someone (usually maleficent) who tries to persuade or force another person to do his bidding
examinee,
testee
someone who is tested (as by an intelligence test or an academic examination)
tragedian
a writer (especially a playwright) who writes tragedies
vower
someone who makes a solemn promise to do something or behave in a certain way
coaxer,
wheedler
someone who tries to persuade by blandishment and coaxing
whistler
someone who makes a loud high sound
wordmonger
a writer who uses language carelessly or pretentiously with little regard for meaning
yenta
(Yiddish) a woman who talks too much; a gossip unable to keep a secret; a woman who spreads rumors and scandal