Tricky x 'It's Easy' crossword

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Across
  1. 2. verb of false
  2. 4. quit+er
  3. 6. the noun of carrying out an order.
  4. 7. someone that studies geology
  5. 10. the noun of excelling your grade.
  6. 12. the study of birds.
  7. 13. the verb of something that slows or stops you.
  8. 15. french word meaning old things
  9. 16. de+fend
  10. 18. de+fine
  11. 19. ex+pand
  12. 20. the verb for succeeding in something.
Down
  1. 1. bene+fit
  2. 3. word that’s spelt similar to stationary
  3. 5. people or countries that are a side of an argument or war.
  4. 8. the sense that entertains you.
  5. 9. the noun of someone who steals
  6. 11. of+fend
  7. 14. dif+er
  8. 17. deci+mate