TALEBEARER
tattletale, tattler, taleteller, talebearer, telltale, blabbermouth
(noun) someone who gossips indiscreetly
Source: WordNet® 3.1
Etymology
Noun
talebearer (plural talebearers)
An indiscreet person who spreads gossip.
Synonyms
• blabbermouth, gossip, rumormonger, telltale; see also gossiper
Source: Wiktionary
Tale"bear`er, n.
Definition: One who officiously tells tales; one who impertinently or
maliciously communicates intelligence, scandal, etc., and makes
mischief.
Spies and talebearers, encouraged by her father, did their best to
inflame her resentment. Macaulay.
Source: Webster’s Unabridged Dictionary 1913 Edition