The term 'SPA SPONGE' is a combination of two words, 'SPA' and 'SPONGE'. The first word, 'SPA', refers to a type of health resort or facility that offers various treatments such as massage, sauna, and other forms of relaxation. The second word, 'SPONGE', is a type of absorbent material that is used for cleaning and bathing. The crossword solution for this term is 'LOOFA', which is a type of exfoliating SPONGE made from the fibrous material of the loofah plant. It is commonly used in spas and baths to remove dead skin cells and promote healthy skin.