The term 18 LOUISES is a crossword solution that can be broken down into two words: ROIS (4 letters) and LOUISES (14 letters). ROIS is the French word for 'kings, ' while LOUISES is a reference to the 18 kings of France named Louis. The 18 kings of France named Louis include Louis I, Louis II, Louis III, Louis IV, Louis V, Louis VI, Louis VII, Louis VIII, Louis IX, Louis X, Louis XI, Louis XII, Louis XIII, Louis XIV, Louis XV, Louis XVI, Louis XVII, and Louis XVIII.