The term "stool pigeon" is a slang expression for a person who provides information to law enforcement about criminal activity. Other synonyms for this term include "informant," "snitch," "rat," "fink," "whistleblower," "turncoat," "betrayal," "treachery," and "double-crosser." Using such terms may be offensive to some people, which is why it is essential to be cautious and respectful when discussing sensitive issues like law enforcement, criminal activities, and private investigations. Whether discussing such topics with friends, colleagues, or clients, it is essential to use appropriate language that does not harbor derogatory connotations or disrespect.