Synonyms for Roman Catholic (same or very similar meaning)
WordNet sense 1 (the Christian Church based in the Vatican and presided over by a pope and an episcopal hierarchy):
Church of Rome, Roman Catholic Church, Roman Church, Western ChurchWordNet sense 2 (of or relating to or supporting Romanism):
papist, roman, papistic, papistical, popish, r.c., Romanist, romishFrom the ODE community, based on WordNetadd/edit