| Similarity | Rank | |
|---|---|---|
| subterranean | 0.819 | 33296 |
| Underground | 0.753 | 16386 |
| tunnels | 0.737 | 14642 |
| above-ground | 0.711 | 72628 |
| sewers | 0.700 | 32294 |
| aboveground | 0.668 | 91881 |
| caverns | 0.668 | 37863 |
| catacombs | 0.663 | 65591 |
| disused | 0.657 | 51805 |
| vaults | 0.639 | 34826 |
| manhole | 0.638 | 54038 |
| cavern | 0.629 | 29318 |
| rock | 0.625 | 1784 |
| aqueducts | 0.622 | 95641 |
| sewer | 0.621 | 13245 |
| passageways | 0.619 | 51897 |
| excavating | 0.617 | 54456 |
| excavate | 0.616 | 59363 |
| Subterranean | 0.616 | 97693 |
| sewage | 0.612 | 15787 |
| basements | 0.609 | 32511 |
| wasteland | 0.608 | 34598 |
| basement | 0.606 | 6421 |
| wastelands | 0.605 | 89150 |
| excavation | 0.605 | 20763 |