in·form·er n: informant
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.
(one providing criminal information) noun
accuser, auctor, complainant, criminal information supplier, impeacher, indicter, informant, information supplier, one who supplies criminal information to the police, police tipper, squealer, tipster, witness against
associated concepts: corroboration, reliable informer
(a person who provides information) noun
adviser, announcer, annunciator, communicant, communicator, courier, crier, delator, divulger, envoy, harbinger, herald, intelligencer, messenger, notifier, prodaimer, relater, reporter, source, spokesman, teller, tipper, tipster, warner
accuser, bystander, deponent, eyewitness, harbinger, indicator, informant, spy, witness
Burton's Legal Thesaurus. William C. Burton. 2006
n.A person who confidentially gives information about a crime to police officers; also called an informant.
The Essential Law Dictionary. — Sphinx Publishing, An imprint of Sourcebooks, Inc. Amy Hackney Blackwell. 2008.
n. One who, privy to the commission of a crime, confidentially communicates with the police or other governmental entity about it.
Webster's New World Law Dictionary. Susan Ellis Wild. 2000.