The term 'SOAP ADDITIVE' can be broken down into two crossword solutions: ALOE (4 letters) and LANOLIN (7 letters). ALOE is a plant extract that is often used in skincare products due to its moisturizing and healing properties. It is also used as an additive in soaps to help nourish and protect the skin. LANOLIN is a wax-like substance derived from sheep's wool that is often used in cosmetics and skincare products. It is also used as an additive in soaps to help soften and protect the skin.