grunter

plural grunters

1. One who grunts.

   Dalton, the winner of nine grand slam doubles titles, claims she would have been prepared to forfeit a match against the grunter par excellence, Maria Sharapova — and has urged the current generation of tennis players to do so.

   2007 December 19, Linda Pearce, “Tennis grunters told to stop the racket”, in The Age

2. Any of a group of fish of the family Terapontidae, which make a grunting sound when caught.
3. slangA pig.

   A pig fight on board ship has always amused me very much: stand on the bridge, and look down into the crowded pen of grunters […]

   1875, W. R. Ancketill, The Adventures of Mick Callighin, M.P.

   1 more example

   We did but keep you surety for our son, / If this be he, — or a draggled mawkin, thou, / That tends her bristled grunters in the sludge[.]

   1849, Tennyson, Poems, volume 2, page 224

4. datedbrass foundingA hook used in lifting a crucible.