The term 'in a heap' can be expressed in three different ways in a crossword puzzle. The first is 'piled, ' which is five letters long and means to stack or arrange something in a disorderly way. The second is 'pled, ' which is four letters long and means to make a solemn promise or commitment. The third is 'piledup, ' which is seven letters long and means to accumulate or gather something in a disorderly way.