Turning adjectives into nouns using the suffix ity.

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Across
  1. 2. simplicity
  2. 4. density
  3. 5. stupidity
  4. 7. opportunity
  5. 8. complexity
  6. 9. divinity
  7. 10. nationality
  8. 13. purity
  9. 14. activity
Down
  1. 1. ability
  2. 2. security
  3. 3. responsibility
  4. 6. community
  5. 11. immunity
  6. 12. reality