Word formation (nouns)

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Across
  1. 4. Make a noun out of an adjective meaning ‘not’ (fair)
  2. 6. Form the opposite of a word (regard)
  3. 7. Turn the verb into a noun (know)
Down
  1. 1. Turn the verb into a noun (assist)
  2. 2. Turn the verb into a noun (cook)
  3. 3. Turn a verb into a noun describing a person who does (paint)
  4. 5. Make a noun out of a verb (suspect)