Stems 11

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Across
  1. 5. Dormancy, Overwinter
  2. 7. Aggressive, Combative
  3. 10. Flying reptile, Winged lizard
  4. 11. Wintry, Frosty
  5. 12. Classification, Categorization
  6. 13. steady flow, running
  7. 15. Micrometer, Millionth of a meter
  8. 17. Money, Legal tender
  9. 18. Bird expert, Avian researcher
  10. 20. Miniature world, Small-scale representation
  11. 21. Pre-war, Before conflict
Down
  1. 1. Wing-flapping aircraft, Bird-like flying machine
  2. 2. Single-colored, One-hued
  3. 3. Animal stuffing, Mounting
  4. 4. Bird study, Avian science
  5. 6. Hostile, Antagonistic
  6. 8. Chopper, Whirlybird
  7. 9. Sentence structure, Grammatical arrangement
  8. 14. Recurring, Repeated
  9. 16. Genetic carrier, DNA package
  10. 19. Spherical bacteria, Coccus