WordNet (r) 3.0 (2006):

manners
    n 1: social deportment; "he has the manners of a pig"

Moby Thesaurus II by Grady Ward, 1.0:

112 Moby Thesaurus words for "manners":
   action, actions, activity, acts, address, affectation, air,
   amenities, bearing, behavior, behavior pattern, behavioral norm,
   behavioral science, bienseance, bon ton, carriage, civilities,
   civility, comity, comportment, conduct, conformity, consuetude,
   convention, correctitude, correctness, courtliness,
   culture pattern, custom, decencies, decorum, demeanor, deportment,
   diplomatic code, doing, doings, elegance, elegancies,
   established way, etiquette, exquisite manners, fashion, folkway,
   formalities, gestures, goings-on, good behavior, good form,
   good manners, guise, maintien, manner, mannerliness, method,
   methodology, methods, mien, modus vivendi, mores, motions,
   movements, moves, natural politeness, observable behavior,
   observance, pattern, point of etiquette, poise, polite behavior,
   politeness, politesse, port, pose, posture, practice, praxis,
   prescription, presence, procedure, proceeding, proper thing,
   proprieties, protocol, punctilio, quiet good manners, ritual,
   rules of conduct, savoir-faire, savoir-vivre, social code,
   social conduct, social convention, social graces,
   social procedures, social science, social usage, standard behavior,
   standard usage, standing custom, style, tactics,
   time-honored practice, tone, tradition, usage, use, way,
   way of life, ways, what is done, wont, wonting