tipster[noun]Synonyms: informer, betrayer, canary, fink, nark, snitch, squealer, stool pigeon, talebearer, tattler
[TahlilGaran] English Synonym Dictionary ▲
tip‧ster /ˈtɪpstə $ -ər/
noun [countable] someone who gives information about which horse is likely to win a race
[TahlilGaran] Dictionary of Contemporary English ▲