pile
noun
1.
a collection of objects laid on top of each other
Derived from:
pile 2.
4.
5.
battery consisting of voltaic cells arranged in series; the earliest electric battery devised by Volta
6.
7.
the yarn (as in a rug or velvet or corduroy) that stands up from the weave
8.
a nuclear reactor that uses controlled nuclear fission to generate energy