Etymology : Words with 'spec', 'un' or 'uni'

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Across
  1. 1. A vehicle with one wheel
  2. 3. One who looks on or watches events, shows, games, etc.
  3. 6. Done or undertaken by a single person or a group
  4. 8. Looking back at the past event(s)
  5. 9. To look at something and make guesses about its identity, nature, etc
  6. 10. An imaginary horse-like structure with one horn
  7. 11. A pair of glasses that help someone to see better
  8. 14. Having one opinion held by the consent of all
  9. 15. To look up to someone
Down
  1. 2. To look into something carefully
  2. 4. All things including Earth, Star, Planets,etc. viewed as one system
  3. 5. To look into or examine one's own thoughts and emotions
  4. 7. A way of looking at things
  5. 12. The quality of being one
  6. 13. Having any form without any variation