Synonyms and related words :
Greek, affiliate, associate, belonger, bon vivant, brother, card-carrier, card-carrying member, cardholder, charter member, clubber, clubman, clubwoman, committeeman, comrade, conventioneer, conventioner, conventionist, dues-paying member, enlistee, enrollee, excellent companion, fellow, fraternity man, good company, good mixer, guildsman, honorary member, initiate, insider, life member, man-about-town, member, mixer, nightclub habitue, one of us, playboy, pleasant company, pledge, sister, social lion, socius, sorority girl, sorority woman