1. Interact
2. Mutualism
3. Home
4. Help
5. Food
6. Relationship
7. Predation
8. Predator
9. Preys
10. Competition
11. —
12. —
13. Harmed
14. Commensalism
15. Commensals
16. —
17. Parasitism
18. Parasite
Sorry, I’m not sure about numbers 11, 12 and 16!