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informer (n.)

late 14c., enfourmer "instructor, one who teaches or gives advice," from inform (Middle English enfourmen) and also from Old French enformeor. Meaning "one who communicates information" is mid-15c.; sense of "one who gives information against another" (especially in reference to law-breaking) is c. 1500.

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Definitions of informer from WordNet

informer (n.)
one who reveals confidential information in return for money;
Synonyms: betrayer / rat / squealer / blabber
From wordnet.princeton.edu