No, s is not in the scrabble dictionary
...but would be worth 1 points.
More English words begin with the letter "S" than any other letter of the alphabet.
1. Mathematics second (of arc).
2. Second (unit of time).
4. Strange quark.
1. Any of the speech sounds represented by the letter s.
2. Something shaped like the letter S.
3. The 19th in a series.
4. The 19th letter of the modern English alphabet.
5. Something shaped like the letter S.