Affixes

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Across
  1. 4. a vehicle used *underwater*
  2. 7. two or more species of animals associating *together*
  3. 8. a 3-sided shape
  4. 9. a force *beyond* scientific understanding or *natural* laws
Down
  1. 1. occurring *after* trauma
  2. 2. *half* a circle
  3. 3. say or estimate what'll happen in the future
  4. 5. *Not* stopping
  5. 6. a word or phrase that means exactly or nearly the same as another word or phrase