What is another word for "duty"?

Roget's Thesaurus (1911) lists these synonyms for "duty": all, and, armed, behavior, bold, bon, cardinal, clear, credit, delight, desert, deserve, devil, discharge, distinction, dole, done, droit, due, equable, equal, equitableness, equity, ethics, even, evenhanded, every, excellence, fair, favor, fides, field, fit, fitness, for, fulfillment, give, good, hath, his.