1. S; s
2. south
3. sulfur
4. nth year in the Shōwa era (1926.12.25-1989.1.7)
5. small
6. second
7. subject
8. sadist; sadistic
9. sister (female partner in a homosexual relationship)
10. S rank (usu. top rank on a SABCDEF scale); S grade; best class
likely from スーパー or スペシャル