What is another word for informer?
Pronunciation: [ɪnfˈɔːmə] (IPA) 
An informer is someone who provides information, typically to law enforcement or other authorities. Other synonyms for informer include snitch, rat, stool pigeon, tattletale, and whistleblower. A snitch is someone who informs on others for personal gain. A rat is a snitch who betrays friends or associates. A stool pigeon is a person who feigns friendship to gain the confidence of others and then reports their actions to the police. A tattletale is someone who reports trivial or harmless information. A whistleblower is someone who reports illegal, unethical, or dangerous activity within an organization. Regardless of the term used, an informer is often seen as untrustworthy and disloyal by others.
