Suffixes!

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Across
  1. 3. fluffy + er
  2. 6. shelf + s
  3. 8. reading + ing
  4. 9. space + ious
  5. 11. prove + en
  6. 13. plan + ed
  7. 14. play + able
  8. 16. knife + s
Down
  1. 1. fancy + ness
  2. 2. use + able
  3. 4. flat + en
  4. 5. deny + al
  5. 6. spin + able
  6. 7. pride + ful
  7. 10. sunny + est
  8. 12. vacate + ion
  9. 15. annoy + ed