ram

A male sheep.

Any of several devices used to drive, batter, or crush by forceful impact, especially.

A battering ram.

The weight that drops in a pile driver or steam hammer.

The plunger or piston of a force pump or hydraulic press.

A hydraulic ram.

A projection on the prow of a warship, used to batter or cut into enemy vessels.

A ship having such a projection.