What is another word for "guard"?

Roget's Thesaurus (1911) lists these synonyms for "guard": aback, abaft, advance, advanced, aft, after, ahead, aitchbone, and, anterior, anteriority, astern, ayah, back, background, backside, backwards, beak, before, behind, bend, bodyguard, bone, bonne, bow, breech, bring, brow, buttock, castellan, caudal, chine, coast, coin, come, concierge, confront, costa, countenance, croup.