Synonyms for MO (same or very similar meaning)
WordNet sense 1 (a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel):
molybdenumWordNet sense 2 (a midwestern state in central United States; a border state during the American Civil War, Missouri was admitted to the Confederacy without actually seceding from the Union):
Missouri, Show Me StateFrom the ODE community, based on WordNetadd/edit