Pen

1. An enclosure (enclosed area) used to contain domesticated animals, especially sheep or cattle.

   There are two steers in the third pen.

2. A prison cell.

   They caught him with a stolen horse, and he wound up in the pen again.

3. The bullpen.

   Two righties are up in the pen.

verb

To enclose in a pen.

1. A tool, originally made from a feather but now usually a small tubular instrument, containing ink used to write or make marks.

   He took notes with a pen.

2. A writer, or his style.

   He has a sharp pen.

3. Marks of ink left by a pen.

   He's unhappy because he got pen on his new shirt.

4. A light pen.
5. The internal cartilage skeleton of a squid, shaped like a pen.
6. A feather, especially one of the flight feathers of a bird, angel etc.
7. A wing.

verb

To write (an article, a book, etc.).

noun

A female swan.

noun

Penalty.