Plural of Nouns

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Across
  1. 1. moose
  2. 4. radius
  3. 5. bacterium
  4. 8. shrimp
  5. 9. die
  6. 13. stimulus
  7. 14. nucleus
  8. 15. series
Down
  1. 2. syllabus
  2. 3. quiz
  3. 6. tuna
  4. 7. louse
  5. 10. index
  6. 11. alumnus
  7. 12. wolf