Yes, let is a Scrabble word!

Verb

1. Make it possible through a specific action or lack of action for something to happen

2. Actively cause something to happen

3. Consent to, give permission

4. Cause to move; cause to be in a certain position or condition

5. Leave unchanged

6. Grant use or occupation of under a term of contract

Noun

1. A brutal terrorist group active in Kashmir; fights against India with the goal of restoring Islamic rule of India

2. A serve that strikes the net before falling into the receiver's court; the ball must be served again