An English assignment (insects,sea animals,history,space,medicine)

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Across
  1. 2. A long axeheaded weapon of old
  2. 4. He who fixes your health
  3. 6. A harder plant of the sea
  4. 8. The mount of the sea
  5. 9. He who helps first
  6. 10. The name of a poor person in older times
  7. 12. A big seal with tusks
  8. 13. He who defended in ye old times
  9. 14. He who rules
  10. 15. He who comes from space
Down
  1. 1. That what is made by spiders
  2. 3. He who goes to space
  3. 5. He who plunders the sea
  4. 7. A spotted bug, sometimes called a bird
  5. 8. He who stings
  6. 11. A plant of the sea