Definitions of pile:

• noun:   the yarn (as in a rug or velvet or corduroy) that stands up from the weave

  Example: "For uniform color and texture tailors cut velvet with the pile running the same direction"

• noun:   a column of wood or steel or concrete that is driven into the ground to provide support for a structure
• noun:   a collection of objects laid on top of each other
• noun:   a large sum of money (especially as pay or profit)
• noun:   (often followed by `of') a large number or amount or extent
• noun:   battery consisting of voltaic cells arranged in series; the earliest electric battery devised by Volta
• noun:   fine soft dense hair (as the fine short hair of cattle or deer or the wool of sheep or the undercoat of certain dogs)
• noun:   a nuclear reactor that uses controlled nuclear fission to generate energy
• verb:   place or lay as if in a pile

  Example: "The teacher piled work on the students until the parents protested"

• verb:   arrange in stacks
• verb:   press tightly together or cram
• name:  A surname (very rare: popularity rank in the U.S.: #31344)