Persuasive words - spelling

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Across
  1. 2. oo sound represented by 1 vowel
  2. 3. 2 syllable. Follows an old spelling rule
  3. 5. long vowel sound without a vowel digraph
  4. 8. vowel digraph. To make it plural add es
  5. 10. 4 syllables
  6. 13. 3 syllables
  7. 14. prefix means with.
  8. 16. contend, maintain, reason, debate
  9. 17. to find out or ascertain something, usually after investigation
  10. 18. base word for resolution
Down
  1. 1. to talk about something at length and in detail, especially as part of a formal exchange of opinion
  2. 4. 1 syllable. 1 digraph
  3. 5. 2 syllables. To add the suffix tion to change the meaning, drop the last letter
  4. 6. 2 rhyming syllables
  5. 7. 5 letters, 4 sounds
  6. 9. 2 syllables. Rule: c followed by e says s
  7. 11. base word + suffix
  8. 12. w sound is not spelt with a w
  9. 15. compound word
  10. 19. opinion, belief, contention