Yes, leak is a Scrabble word!

Verb

1. Tell anonymously

2. Be leaked

3. Enter or escape as through a hole or crack or fissure

4. Have an opening that allows light or substances to enter or go out

Noun

1. An accidental hole that allows something (fluid or light etc.) to enter or escape

2. Soft watery rot in fruits and vegetables caused by fungi

3. A euphemism for urination

4. The discharge of a fluid from some container

5. Unauthorized (especially deliberate) disclosure of confidential information