Find the "First Syllables"

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Across
  1. 4. Experience
  2. 6. Temperature
  3. 9. Literature
  4. 13. Independence
  5. 14. Education
  6. 15. Address
  7. 16. Calculate
  8. 17. Opportunity
  9. 18. Psychology
  10. 19. Furniture
  11. 21. Discover
  12. 23. Government
Down
  1. 1. Vocabulary
  2. 2. Mathematics
  3. 3. Democracy
  4. 5. Celebrate
  5. 7. Hygiene
  6. 8. Biology
  7. 10. Technology
  8. 11. Relationship
  9. 12. Knowledge
  10. 15. Apology
  11. 18. Philosophy
  12. 20. Revolution
  13. 22. Socialize