One word substution

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Across
  1. 3. The one who looks at the brighter side of everything
  2. 6. A large cage, building, or enclsure to keep birds
  3. 8. The one who eats human flesh
  4. 9. A place or scene of activity, debate, or conflict
  5. 10. The study of rocks and soil
Down
  1. 1. The one who settles in another country
  2. 2. The study of plants
  3. 4. A close-fitting cover for the balde of a knife or sword
  4. 5. A self-governing country or region
  5. 7. A person who draws maps