Noun

• S: (n) informer, betrayer, rat, squealer, blabber (one who reveals confidential information in return for money)
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• W: (v) inform [Related to: informer] (act as an informer) "She had informed on her own parents for years"
• W: (v) betray [Related to: betrayer] (deliver to an enemy by treachery) "Judas sold Jesus"; "The spy betrayed his country"
• W: (v) betray [Related to: betrayer] (give away information about somebody) "He told on his classmate who had cheated on the exam"
• W: (v) rat [Related to: rat] (give away information about somebody) "He told on his classmate who had cheated on the exam"
• W: (v) squeal [Related to: squealer] (confess to a punishable or reprehensible deed, usually under pressure)
• W: (v) blab [Related to: blabber] (divulge confidential information or secrets) "Be careful--his secretary talks"
• W: (v) blabber [Related to: blabber] (speak (about unimportant matters) rapidly and incessantly)