1. ball; sphere; globe; orb
2. bead (of sweat, dew, etc.); drop; droplet
3. ball (in sports); pitch (e.g. in baseball)
esp. 球
4. pile (of noodles, etc.)
6. bulb (i.e. a light bulb)
esp. 球
7. lens (of glasses, etc.)
8. bead (of an abacus)
esp. 玉, 珠
9. ball (i.e. a testicle)
esp. 玉
10. gem; jewel (esp. spherical; sometimes used figuratively); pearl
esp. 玉, 珠; also written as 璧
11. female entertainer (e.g. a geisha)
12. person (when commenting on their nature); character
13. item, funds or person used as part of a plot
15. precious; beautiful; excellent