| Similarity | Rank | |
|---|---|---|
| ice_age | 0.698 | 82789 |
| Ice_Age | 0.665 | 78392 |
| million_of_year | 0.664 | 47068 |
| dinosaur | 0.653 | 10877 |
| around_[number]_year_ago | 0.649 | 99750 |
| modern_human | 0.648 | 75948 |
| Jurassic | 0.640 | 97947 |
| Neanderthal | 0.620 | 52195 |
| Homo_sapiens | 0.616 | 91445 |
| thousand_of_year_ago | 0.611 | 91960 |
| fossil | 0.604 | 11711 |
| prehistoric | 0.599 | 40720 |
| volcanic_activity | 0.583 | 80643 |
| lava_flow | 0.571 | 93428 |
| the_Bronze_Age | 0.569 | 84065 |
| vertebrate | 0.567 | 40301 |
| life_form | 0.565 | 31360 |
| fauna | 0.558 | 23619 |
| about_[number]_year_ago | 0.554 | 22341 |
| scientist_say | 0.549 | 57227 |
| mammal | 0.548 | 9309 |
| biota | 0.546 | 81008 |
| human_evolution | 0.544 | 82895 |
| herbivore | 0.543 | 55886 |
| life_on_Earth | 0.543 | 67776 |