| Similarity | Rank | |
|---|---|---|
| 9_/_[number] | 0.793 | 7060 |
| the_9_/_[number]_attack | 0.717 | 41728 |
| the_World_Trade_Center | 0.713 | 43422 |
| after_9_/_[number] | 0.652 | 41674 |
| WTC | 0.651 | 53436 |
| Flight_[number] | 0.608 | 91039 |
| terrorist_attack | 0.598 | 15398 |
| since_9_/_[number] | 0.581 | 64126 |
| at_the_Pentagon | 0.554 | 81779 |
| September_[number]_th | 0.552 | 60181 |
| after_September_[number] | 0.548 | 75057 |
| Ground_Zero | 0.547 | 80186 |
| Sandy_Hook | 0.545 | 93014 |
| terror_attack | 0.540 | 43895 |
| Bin_Laden | 0.536 | 39834 |
| JFK | 0.526 | 27019 |
| post-9_/_[number] | 0.525 | 87391 |
| on_9_/_[number]_/_[number] | 0.523 | 61889 |
| a_terrorist_attack | 0.522 | 62650 |
| the_invasion_of_Iraq | 0.517 | 59891 |
| on_Sept._[number] | 0.515 | 15988 |
| the_Pentagon | 0.503 | 10999 |
| 9_/_[number]_/_[number] | 0.500 | 28572 |
| plane_crash | 0.498 | 64597 |
| Osama_bin_Laden | 0.496 | 29989 |