Sub words

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Across
  1. 3. under the ground
  2. 4. accept or yield to a superior power
  3. 5. below the level of awareness
  4. 8. taking one amount away from another
  5. 9. under ground transportation
Down
  1. 1. the title below the main title
  2. 2. the act of replacing something
  3. 6. arrange to receive something regularly
  4. 7. under the water
  5. 8. to cause something to be under water