Synonyms of informant

1 Syllable
fink, snitch, sneak, nark, rat
2 Syllables
stoolie, weasels, tipster, snitcher, snitching, weasel, tipsters, source, watchdog
3 Syllables
monitor, weaseling, weaseled, monitors, canary
4 Syllables
eaves-dropper, whistleblower, whistle-blower, tattletale
5 Syllables
invigilator