whistleblower (noun) tattletale/tattler: person who gossips, tells rumors
Sinonime: bigmouth, blabberer, blabbermouth, busybody, canary, fat mouth, fink,
gossip, informer, rat, rumormonger, scandalmonger, snitch, squealer, stool pigeon, talebearer, taleteller, telltale, tipster,
troublemaker, whistleblower, windbag