A heap is a large quantity of something, and the crossword solutions all refer to this concept. OODLES (6 letters) is an informal term for a large amount, usually used in a humorous way. LOTS (4 letters) is another informal term for a large amount. TONS (4 letters) is a more formal term for a large amount, usually referring to weight. Loads (5 letters) is an informal term for a large amount, usually referring to a physical object. REAMS (5 letters) is a formal term for a large amount, usually referring to paper. SCADS (5 letters) is an informal term for a large amount, usually referring to money.