Yes, fuller is a Scrabble word!

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. United States jurist and chief justice of the United States Supreme Court (1833-1910)

2. United States architect who invented the geodesic dome (1895-1983)

3. A workman who fulls (cleans and thickens) freshly woven cloth for a living