Yes, full is a Scrabble word!

Adverb

1. To the greatest degree or extent; completely or entirely; (`full' in this sense is used as a combining form)

Verb

1. Beat for the purpose of cleaning and thickening

2. Make (a garment) fuller by pleating or gathering

3. Increase in phase

Adjective

1. Containing as much or as many as is possible or normal

2. Constituting the full quantity or extent; complete

3. Complete in extent or degree and in every particular

4. Filled to satisfaction with food or drink

5. (of sound) having marked deepness and body

6. Having the normally expected amount

7. Being at a peak or culminating point

8. Having ample fabric

Noun

1. The time when the Moon is fully illuminated