The word "bismuthian" refers to something that is related to or contains bismuth. Some synonyms for this word include bismuthic, bismuthous, and bismuthiferous. Bismuthic refers to compounds that contain bismuth in its highest oxidation state, while bismuthous refers to compounds that contain bismuth in its lower oxidation state. Bismuthiferous refers to any mineral or substance that contains bismuth in its composition. Other related words include bismuthinite, a mineral that contains bismuth and sulfur, and bismuthyl, a cation containing bismuth in its highest oxidation state. Using synonyms can help writers to vary their language and avoid repeating the same word too often.