What's the difference between rammer and rummer?

Rammer

Definition:

(n.) One who, or that which, rams or drives.
(n.) An instrument for driving anything with force; as, a rammer for driving stones or piles, or for beating the earth to more solidity
(n.) A rod for forcing down the charge of a gun; a ramrod
(n.) An implement for pounding the sand of a mold to render it compact.

Example Sentences: