Agent provocateur noun – A secret agent who incites suspected persons to commit illegal acts. Stoolie and agent provocateur are semantically related. In some cases you can use "Stoolie" instead a noun phrase "Agent provocateur".
Stoolie noun – A person who provides information about another's wrongdoing. Agent provocateur and stoolie are semantically related. Sometimes you can use "Agent provocateur" instead a noun "Stoolie".