The SUffixes -ance and -ence

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Across
  1. 2. the ability to apply knowledge to manipulate one's environment or to think abstractly as measured by objective criteria (such as tests)
  2. 4. the state of being allied : the action of allying
  3. 6. the ability to govern and discipline oneself by the use of reason
  4. 7. the quality or state of being brilliant
  5. 10. an attitude of superiority manifested in an overbearing manner or in presumptuous claims or assumptions
  6. 12. the quality or state of being accepted or acceptable
  7. 14. discourse marked by force and persuasiveness
  8. 15. the quality of being important
Down
  1. 1. the state of being assured: such as being certain in the mind
  2. 3. a conclusion derived through logic, something produced by a cause or necessarily following from a set of conditions
  3. 4. the act or fact of attending something or someone
  4. 5. the quality or state of being independent
  5. 8. : the art or power of using such discourse
  6. 9. the quality or state of being radiant
  7. 11. the quality or state of being brilliant
  8. 13. the act of relying : the state of being reliant