Synonyms of whistler

1 Syllable
fink, snitch, nark, rat
2 Syllables
stoolie, gasser, tabby, squealer, bigmouth, ratfink, tattler, tipster, blabber, snitcher, squeaker, peacher, gassers, gossip, polly, quidnunc, windbag
3 Syllables
blabbermouth, canary, telltale, informer
4 Syllables
busybody, rumormonger, scandalmonger, talebearer, taleteller, whistleblower, sleazemonger, troublemaker, tattletale