We don't have synonyms for gorget yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are gorge, forget and gorged.
"1968: Hawkmoon whipped his sword from the scabbard, leaped forward, and drove the blade into the throat of the warrior just below his gorget. -- Michael Moorcock, The Mad God's Amulet (Gollancz 2003, p. 209)"
1917: Washington Irving, The Legend of Sleepy Hollow - "There was ... the golden-winged woodpecker, with his crimson crest, his broad black gorget, and splendid plumage ..."
"1968: Hawkmoon whipped his sword from the scabbard, leaped forward, and drove the blade into the throat of the warrior just below his gorget. -- Michael Moorcock, The Mad God's Amulet (Gollancz 2003, p. 209)"
1917: Washington Irving, The Legend of Sleepy Hollow - "There was ... the golden-winged woodpecker, with his crimson crest, his broad black gorget, and splendid plumage ..."