1. Noun

   S; s

2. south

3. sulfur

   see 硫黄

4. Prefix

   nth year in the Shōwa era (1926.12.25-1989.1.7)

   see 昭和

5. Noun

   small

6. second

7. subject

   Grammarsee 主語

8. sadist; sadistic

   see Ｍ

9. sister (female partner in a homosexual relationship)

10. S rank (top rank on a SABCDEF scale); S grade; best class

    likely from スーパー or スペシャル

Also written ｓ【エス】esu