The term 'KIND OF MOTHER' can be broken down into two crossword solutions: DEN (3 letters) and STEP (4 letters). DEN is a noun that refers to a small, secluded room or area, usually in a home. STEP is an adjective that describes a mother who is not the biological parent of a child, but has taken on the role of a parent. Therefore, the term 'KIND OF MOTHER' can refer to either a mother who has a DEN in her home, or a stepmother who has taken on the role of a parent.