fishpool

From Middle English fischpol, from Old English fisċpōl (“fishpond”), equivalent to fish +‎ pool.

fishpool (plural fishpools)

1. A pool of water containing fish; fishpond.
   • 1960 July 11, Harper Lee, To Kill a Mockingbird, Philadelphia, Pa.; New York, N.Y.: J[oshua] B[allinger] Lippincott Company, →OCLC:

     “Yes,” said our father, when Jem asked him if we could go over and sit by Miss Rachel’s fishpool with Dill, as this was his last night in Maycomb.

• foolship, poolfish