squealer

Noun

 * 1) Any animal or person who squeals.
 * 2) A pig.
 * 3)  An informant.
 * 4)  A kind of jug used to carry beer having 1 litre or 32 ounce capacity (half the size of a growler).
 * 5) Anything that makes a squealing noise.
 * 6) The European swift.
 * 7) The harlequin duck.
 * 8) The American golden plover.
 * 9) A young pigeon.