Synonyms and related words :
Greek, affiliate, associate, belonger, brother, card-carrier, card-carrying member, cardholder, charter member, clubber, clubman, clubwoman, committeeman, comrade, confidential information, conventioneer, conventioner, conventionist, dues-paying member, enlistee, enrollee, fellow, fraternity man, guildsman, honorary member, initiate, inside dope, inside information, joiner, life member, member, one of us, pipeline, pledge, sister, socius, sorority girl, sorority woman, the lowdown