Collective Nouns

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Across
  1. 2. of ants
  2. 7. of cattle
  3. 8. of singers
  4. 9. of kangaroo
  5. 10. of musicians
  6. 12. of ships
  7. 13. of oysters
  8. 14. of wolves
  9. 17. of bees
  10. 18. of birds
Down
  1. 1. of mountains
  2. 3. of crows
  3. 4. of fish
  4. 5. of dolphins
  5. 6. of lions
  6. 7. of penguins
  7. 10. of grapes
  8. 11. of cards
  9. 13. of hay
  10. 15. of students
  11. 16. of geese
  12. 17. of papers