Semantic fields.

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Across
  1. 5. english, maths, chemistry
  2. 6. apples, bananas, oranges
  3. 7. horror, comedy, romance
  4. 8. football, dancing, painting
Down
  1. 1. sharpener, pencil, eraser
  2. 2. rock, kpop, rap
  3. 3. China, Japan, India
  4. 4. dogs, cats, rabbits