AUGH or OUGH sounds like /aw/

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Across
  1. 7. CAU past tense of catch
  2. 9. THO process or power of thinking
  3. 11. THO careless of consequences
  4. 13. BRO past tense of bring
  5. 15. HAU arrogant or disdainful
  6. 17. THO engaged in or given to meditation
  7. 18. OUG expressing duty of rightness
Down
  1. 1. FOR care or provision for the future
  2. 2. NAU nothing
  3. 3. FOU past tense of fight
  4. 4. SLA kill for foods or skins
  5. 5. SLA abbatoir, where cattle is slaughtered for food
  6. 6. DAU girl or woman in relation to her parent(s)
  7. 8. BOU past tense of buy
  8. 10. WRO beaten out of shape
  9. 12. SOU past tense of seek
  10. 14. NAU disobedient, badly behaved
  11. 16. NOU the digit 0