What is another word for "ring"?

Roget's Thesaurus (1911) lists these synonyms for "ring": about, action, amphitheater, append, arena, balustrade, barricade, barrier, battle, bear, beetle, begirt, bent, bosom, bound, boxing, bury, button, camp, campus, canvas, case, caudate, circumscribe, circumscription, circumvallation, circus, cockpit, compass, confine, confinement, container, containment, cordon, corral, course, daggle, dangle, defense, depend.