1. nature
2. character
3. property
4. quality
5. attribute
6. sexuality
7. sex
8. gender
9. suffix forming adjective from verb
10. suffix forming noun from adjective, corresponding to -ness or -ity
11. essence

classifier: 個

1. square
2. frame
3. rule
4. (legal) case
5. style
6. character
7. standard
8. pattern
9. (grammar) case
10. (classical) to obstruct
11. to hinder
12. (classical) to arrive
13. to come
14. (classical) to investigate
15. to study exhaustively