Informant
/ˌɪˈnfɔrmənt/
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Definition
(noun) One who relays confidential information to someone, especially to the police; an informer.
Sentence Examples
I cannot disclose any information about the informant.
Tom is an informant for the FBI.
CEFR Practice Quiz
The police received a secret tip from a reliable ____ that led them to the stolen goods.