One who gives incriminating information about others:
informant, informer, tattler, tattletale. (Informal) rat, tipster. (Slang) snitch, snitcher, squealer, stoolie, stool pigeon. See knowledge, lawTo give incriminating information about others, especially to the authorities:
inform, talk, tattle, tip3 (off). (Slang) rat, sing, snitch, squeal, stool. Idiom: blow the whistle. See knowledge, lawLearn more about fink