Plurals Not Ending in “S”

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123456
Across
  1. 4. Index (7 letters)
  2. 5. Curriculum (9 letters)
  3. 6. Radius (5 letters, AGAIN)
Down
  1. 1. Focus (4 letters)
  2. 2. Sarcophagus(10 letters)
  3. 3. Moose (5 letters, you know… like sheep is 5 letters)