Prefix e-, ex- and Greek Root 'phon'

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Across
  1. 2. Words that sound the same but mean different things
  2. 4. Method of teaching reading by sounds
  3. 5. To look around or travel through to learn about
  4. 6. A way out
  5. 8. To rub out or remove
  6. 9. To leave out
  7. 11. To send goods out
  8. 14. A reason given to explain
  9. 15. A musical instrument
  10. 16. Come out of
Down
  1. 1. Long piece of music played by an orchestra
  2. 3. Machine for playing recorded sounds
  3. 5. To stretch out
  4. 7. Device to talk across distance
  5. 10. Device worn on ear to hear sounds
  6. 11. To breathe out
  7. 12. Device that makes sounds louder
  8. 13. Cone-shaped device to make voice louder