| No. | Item | Definition |
|---|---|---|
| 1. | actuator | device that moves a mechanism |
| 2. | airline pilot | pilot of an airliner |
| 3. | airman | pilot or aircrew member |
| 4. | airwoman | female pilot or aircrew |
| 5. | architect | planner behind something |
| 6. | astronaut | space traveler; spacecraft operator |
| 7. | author | person who originates something |
| 8. | aviator | aircraft pilot |
| 9. | backbone | main support or strength |
| 10. | balloonist | hot-air balloon pilot |
| 11. | bedrock | fundamental support |
| 12. | bike rider | person who rides a bike |
| 13. | biker | motorcycle rider |
| 14. | boat operator | person who runs a boat |
| 15. | boatman | person who operates a boat |
| 16. | bus operator | person who drives a bus |
| 17. | cabbie | taxi driver |
| 18. | cabby | taxi driver |
| 19. | cabdriver | person who drives a taxi |
| 20. | captain | person commanding a vehicle or vessel |
| 21. | carter | person who drives a cart |
| 22. | charioteer | person who drives a chariot |
| 23. | chauffeur | paid private car driver |
| 24. | coachman | person who drives a carriage |
| 25. | cyclist | person who rides a bicycle |
| 26. | determinant | deciding factor |
| 27. | director | person who directs activity |
| 28. | drive shaft | shaft transmitting power |
| 29. | drive unit | unit that provides drive |
| 30. | drivetrain | system delivering power to wheels |
| 31. | driving force | main motivating cause |
| 32. | enabler | thing that makes something possible |
| 33. | engine | main force behind progress |
| 34. | engineer | person operating a train engine |
| 35. | facilitator | person who makes things easier |
| 36. | factor | contributing cause |
| 37. | ferry operator | person who runs a ferry |
| 38. | ferryman | person who operates a ferry |
| 39. | fighter pilot | military jet pilot |
| 40. | first officer | second-in-command pilot |
| 41. | foundation | underlying basis |
| 42. | founder | person who establishes something |
| 43. | gearbox | gears that transmit power |
| 44. | glider pilot | pilot of a glider |
| 45. | guide | person who leads the way |
| 46. | helicopter pilot | pilot of a helicopter |
| 47. | helmsman | person who steers a vessel |
| 48. | impetus | force that makes something happen |
| 49. | incentive | thing that motivates action |
| 50. | influence | power to affect outcomes |
| 51. | initiator | person who begins something |
| 52. | instigator | person who starts something |
| 53. | key factor | most important factor |
| 54. | leader | person who leads others |
| 55. | linchpin | crucial connecting element |
| 56. | locomotive engineer | train engine operator |
| 57. | long-haul trucker | long-distance truck driver |
| 58. | mainstay | chief support or cause |
| 59. | master mariner | fully qualified ship captain |
| 60. | moped rider | person who rides a moped |
| 61. | motivator | person who motivates others |
| 62. | motive | reason that drives action |
| 63. | motorcyclist | person who rides a motorcycle |
| 64. | motorist | person who drives a motor vehicle |
| 65. | mover | person who makes things happen |
| 66. | navigator | person who directs a route |
| 67. | operator | person who operates a vehicle |
| 68. | originator | person who creates or starts |
| 69. | pilot | person who steers a vehicle |
| 70. | power source | thing that supplies power |
| 71. | power unit | unit that provides power |
| 72. | prime mover | main cause of action |
| 73. | prompt | cause that brings action |
| 74. | propellant | substance that drives motion |
| 75. | propeller | device that drives a craft |
| 76. | propulsion | force that moves something |
| 77. | reason | cause or explanation |
| 78. | rider | person who rides a motorcycle |
| 79. | scooter rider | person who rides a scooter |
| 80. | shipmaster | captain of a ship |
| 81. | skipper | captain of a boat |
| 82. | spacecraft pilot | person who pilots spacecraft |
| 83. | spur | thing that encourages action |
| 84. | steerer | person who steers |
| 85. | steersman | person who steers a vehicle |
| 86. | stimulus | thing that prompts activity |
| 87. | teamster | truck driver; transport worker |
| 88. | test pilot | pilot who tests aircraft |
| 89. | thruster | device providing thrust |
| 90. | train engineer | person who drives a train |
| 91. | transmission | system sending power to wheels |
| 92. | trigger | thing that sets something off |
| 93. | trucker | truck operator |
| 94. | vehicle operator | person who operates a vehicle |
| 95. | vessel master | captain of a ship |
| 96. | vessel operator | person who operates a vessel |
| 97. | wagoner | person who drives a wagon |
| 98. | wheel-turner | person who drives a vehicle |
| 99. | wheelman | person who drives a vehicle |
| 100. | yardmaster | rail yard operations supervisor |
