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. high tide; high water
2. upsurge; peak of activity
3. climax (of a story, a competition etc)
4. to have an orgasm