more and more collective nouns!!

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Across
  1. 3. a __ of words
  2. 6. an __ of wives
  3. 7. a __ of pillows
Down
  1. 1. a __ of wankers
  2. 2. a __ of wikipedians
  3. 4. a __ field of theoretical physicists
  4. 5. an __ of witches