1. control tower a tower with an elevated workspace enclosed in glass for the visual observation of aircraft around an airport
  2. controller a mechanism that controls the operation of a machine
  3. contractor someone who is hired to build things
  4. controlled restrained or managed or kept within certain bounds
  5. contributor a writer published in a periodical or as part of a book
  6. contrast the opposition or dissimilarity of things that are compared
  7. contralto the lowest female singing voice
  8. contralateral on or relating to the opposite side (of the body)
  9. control rod a steel or aluminum rod that can be moved up or down to control the rate of the nuclear reaction
  10. contrite feeling or expressing pain or sorrow for sins or offenses
  11. contributory tending to bring about; being partly responsible for
  12. contracture an abnormal and usually permanent contraction of a muscle
  13. control center the operational center for a group of related activities
  14. control power to direct or determine
  15. counterculture a culture with lifestyles and values opposed to those of the established culture
  16. control board electrical device consisting of a flat insulated surface that contains switches and dials and meters for controlling other electrical devices
  17. control stock shares owned by shareholders who have a controlling interest
  18. contribute provide
  19. contour feather feathers covering the body of an adult bird and determining its shape
  20. controllable capable of being controlled