'uh' sound with 'e' or 'a' spelling

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Across
  1. 4. From the Americas
  2. 6. An constructive argument.
  3. 8. A wall with notes or posters.
  4. 10. Spiritual Person
  5. 15. Beautiful
  6. 17. Capable on one's own.
  7. 18. Something that needs to be solved.
  8. 19. A business or group.
Down
  1. 1. To do something once more.
  2. 2. To place something inside.
  3. 3. A foe or antagonist.
  4. 5. On a topic or subject.
  5. 6. Length between objects.
  6. 7. Shiny or shimmering.
  7. 9. The space inside a 2-D object.
  8. 11. A skill or strength.
  9. 12. To keep safe.
  10. 13. To pluck, plunder, or steal.
  11. 14. A phrase with a subject and action.
  12. 16. An amount of twelve.
  13. 20. Most likely.