words that mean the same

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Across
  1. 2. the opposite of useless
  2. 4. a season that occurs in August
  3. 5. another word for subtraction
  4. 7. another word for addition
  5. 8. I smile when I am
  6. 9. Sometimes I cry when I am
  7. 11. the opposite of cold
  8. 12. another word for trash
Down
  1. 1. the 5th day of the week
  2. 3. some people call a sofa a
  3. 5. another word for repeated addition
  4. 6. when something is not the same
  5. 10. more than a giggle