List 1 & 2: 'ou' or 'ow' words.

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Across
  1. 3. begin to grow
  2. 4. a large gathering of people
  3. 6. ten hundred
  4. 8. the surface of the earth
  5. 10. an opening in a wall or vehicle to let in light
  6. 11. the act or process of growing
  7. 13. to kill or die by submersion in liquid
Down
  1. 1. to wrinkle one's brow
  2. 2. recline comfortably
  3. 3. point of the compass
  4. 5. a patch of shade
  5. 7. rebound up and down
  6. 9. speak or cry loudly
  7. 11. make a low guttural sound
  8. 12. a long, doleful cry