derive nouns from the below verbs

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Across
  1. 4. to choose
  2. 6. to discuss
  3. 7. to argue
  4. 8. to explain
  5. 9. to inform
  6. 10. to recommend
  7. 11. to suggest
Down
  1. 1. to decide
  2. 2. to celebrate
  3. 3. to develop
  4. 5. to achieve