Silent letters

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Across
  1. 2. sounds in words that are the same
  2. 4. a man who serves in armour
  3. 6. high respect
  4. 9. a plant
  5. 10. formal and dignified
Down
  1. 1. a body part on a human
  2. 3. a roughly circular line that starts and finishes in the same place
  3. 5. feeling uncertain
  4. 7. a reply
  5. 8. land surrounded by water