moment, mo, minute, second, bit -- (an indefinitely short time; "wait just a moment"; "in a mo"; "it only takes a minute"; "in just a bit")
molybdenum, Mo, atomic number 42 -- (a polyvalent metallic element that resembles chromium and tungsten in its properties; used to strengthen and harden steel)
Missouri, Show Me State, MO -- (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)