The term 'HALF, IN COMBOS' can be solved by two four-letter words: HEMI and DEMI. HEMI is derived from the Greek word for half, and is used to describe a half-sphere or hemisphere. It is also used to refer to a type of engine that has cylinders arranged in two banks of four, with each bank firing on alternate strokes. DEMI is derived from the French word for half, and is used to describe something that is half-sized or half-length. It is also used to refer to a type of clothing, such as a demi-bra or demi-skirt.