The term 'Kind of Soap' can be broken down into three crossword solutions: LYE (3 letters), SOFT (4 letters), and Castile (7 letters). LYE is a type of alkaline solution that is used in the production of soap. SOFT soap is a type of soap that is made with animal fat or vegetable oil and has a creamy consistency. Castile soap is a type of soap that is made from olive oil and is known for its gentle cleansing properties.