Gorgûn
From Tolkien Gateway
The name used by the Drúedain to refer to the race of Orcs, creatures that they had held as mortal enemies since the First Age. Indeed, the only detailed story we have of the Drúedain from those ancient times, The Faithful Stone, tells of a Drûg using his strange powers to destroy invading Orcs. This enmity was an aid to the people of the Rohirrim in the War of the Ring, because the normally unfriendly Drúedain helped guide them to Minas Tirith in the hope of seeing their hated gorgûn defeated - a hope that was amply fulfilled.
