Plurals with irregular spellings

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Across
  1. 6. plural of nucleus
  2. 7. plural of cactus
  3. 10. plural of matrix
  4. 11. plural of fungus
  5. 13. plural of species
  6. 14. plural of lava
  7. 15. plural of woman
Down
  1. 1. plural of criterion
  2. 2. plural of phenomenon
  3. 3. plural of die
  4. 4. plural of axis
  5. 5. plural of focus
  6. 8. plural of crisis
  7. 9. plural of radius
  8. 12. plural of person