| Similarity | Rank | |
|---|---|---|
| airliner | 0.688 | 74382 |
| plane_crash | 0.663 | 64597 |
| Boeing_[number] | 0.647 | 83928 |
| on_9_/_[number] | 0.608 | 46096 |
| hijacker | 0.606 | 61948 |
| plane | 0.590 | 2288 |
| flight | 0.588 | 2004 |
| flight_crew | 0.581 | 82885 |
| take_off_from | 0.574 | 64053 |
| aircraft | 0.573 | 2733 |
| United_Airlines | 0.572 | 68372 |
| the_World_Trade_Center | 0.571 | 43422 |
| 9_/_[number] | 0.568 | 7060 |
| JFK | 0.555 | 27019 |
| airplane | 0.553 | 8467 |
| Flight | 0.551 | 27186 |
| Flights | 0.551 | 92313 |
| American_Airlines | 0.550 | 49560 |
| WTC | 0.544 | 53436 |
| an_airplane | 0.544 | 55326 |
| an_aircraft | 0.543 | 36924 |
| Airlines | 0.540 | 55211 |
| bomber | 0.536 | 20147 |
| US_Airways | 0.533 | 79729 |
| the_9_/_[number]_attack | 0.532 | 41728 |