Across
- 1. radius
- 4. radii
- 5. cactuses
- 7. calf
- 9. halves
- 11. cactus
- 12. focuses
- 14. calves
- 15. fish
- 18. foci
- 20. selves
- 21. funguses
Down
- 1. radiuses
- 2. species
- 3. oxen
- 6. half
- 8. focus
- 10. fungus
- 11. cacti
- 13. children
- 14. child
- 16. self
- 17. fungi
- 19. ox