Collective nouns

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Across
  1. 2. a group of lions
  2. 4. a group of steps
  3. 8. A group of ants
  4. 9. A group of singers
  5. 10. a group of giraffes
Down
  1. 1. a group of cattle
  2. 3. a group of zebras
  3. 5. A group of stars
  4. 6. a group of cars or aeroplanes
  5. 7. A group of flowers
  6. 8. a group of sailors