derive nouns from the below verbs

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