| Similarity | Rank | |
|---|---|---|
| pilot | 0.755 | 1797 |
| Pilots | 0.652 | 84505 |
| as_a_pilot | 0.598 | 97708 |
| Helicopter | 0.576 | 91029 |
| Pilot_Project | 0.576 | 93280 |
| piloting | 0.563 | 95319 |
| Aircraft | 0.560 | 38754 |
| Prototype | 0.527 | 63814 |
| Launch | 0.522 | 20150 |
| Operational | 0.522 | 72840 |
| Navigator | 0.514 | 71923 |
| Fly | 0.513 | 23863 |
| Experiment | 0.512 | 46456 |
| Case_Study | 0.510 | 47711 |
| Consolidated | 0.507 | 84751 |
| Demonstration | 0.502 | 49073 |
| Flight | 0.499 | 27186 |
| Wing | 0.496 | 22985 |
| Program | 0.494 | 2518 |
| Flying | 0.494 | 33056 |
| Enhanced | 0.493 | 45028 |
| Simulator | 0.493 | 80782 |
| Evaluation_of | 0.490 | 74418 |
| Component | 0.486 | 51300 |
| Project | 0.485 | 1798 |