Synonyms for Barium Sulphate (same or very similar meaning)
WordNet sense 1 (a white insoluble radiopaque powder used as a pigment):
barium sulfate, blanc fixeWordNet sense 2 (a white or colorless mineral (BaSO4); the main source of barium):
barite, barytes, heavy sparFrom the ODE community, based on WordNetadd/edit