The term 'heaped up' can be described by four different crossword solutions: 'STACKED', 'piled', 'inapile', and 'CUMULATE'. 'STACKED' means to arrange IN a PILE, usually IN a neat and orderly fashion. 'Piled' is similar to STACKED, but implies a more disorderly arrangement. 'Inapile' is a combination of the words 'IN' and 'PILE', and suggests that something is placed IN a PILE. Finally, 'CUMULATE' means to accumulate or gather together IN a heap. All of these terms describe the act of heaping up, or gathering together IN a PILE.