DictionaryRoot: -er
Low German
-er
person associated with a trade
1 / 1
noun / verb
cooper
KOO-pur/ˈkuːpər/
A person who makes or repairs barrels, or the work of doing so.
Etymology
The cask or vat base makes this an occupational name for someone who makes such vessels. This follows the possible Low German analysis; the source also allows an unattested Old English origin.