Yes, nail is a Scrabble word!

Verb

1. Attach something somewhere by means of nails

2. Take into custody

3. Hit hard

4. Succeed in obtaining a position

5. Succeed at easily

6. Locate exactly

7. Complete a pass

Noun

1. Horny plate covering and protecting part of the dorsal surface of the digits

2. A thin pointed piece of metal that is hammered into materials as a fastener

3. A former unit of length for cloth equal to 1/16 of a yard