The term 'ADD SPICE TO' can be represented by four different crossword solutions: LIVEN (5 letters), SEASON (6 letters), ENLIVEN (7 letters), and ZIPUP (5 letters). All of these words mean to make something more interesting or exciting. LIVEN means to make something livelier, SEASON means to add flavor or interest, ENLIVEN means to make something more lively or spirited, and zipup means to add energy or enthusiasm. All of these words can be used to describe the act of adding spice to something.