tattler
Pronunciation:
/ˈtætlə//ˈtætlɚ/noun
Definitions
One who tattles (notifies authorities of illicit behavior) or is inclined to do so; a tattletale.
Example: My sister is a big tattler; she always tells Mommy when I hit her!
Synonyms:informantnarcstool pigeontattletaleEither of two similar bird species in the shorebird genus Heteroscelus (Tringa in some taxonomies).
A device fitted to a vehicle to measure mileage etc.
Synonyms:tachograph