| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Abri | 4 | 2 | 2 | 2 |
| Antre | 5 | 3 | 2 | 2 |
| Bunker | 6 | 4 | 2 | 2 |
| Burrow | 6 | 4 | 2 | 2 |
| Cave | 4 | 2 | 2 | 1 |
| Cloaca | 6 | 3 | 3 | 2 |
| Cove | 4 | 2 | 2 | 1 |
| Den | 3 | 2 | 1 | 1 |
| Dugout | 6 | 3 | 3 | 2 |
| Foxhole | 7 | 4 | 3 | 2 |
| Fox Hole | 8 | 5 | 3 | 2 |
| Grot | 4 | 3 | 1 | 1 |
| Grotto | 6 | 4 | 2 | 2 |
| Hole | 4 | 2 | 2 | 1 |
| Lair | 4 | 2 | 2 | 1 |
| Metro | 5 | 3 | 2 | 2 |
| Sand Trap | 9 | 7 | 2 | 2 |
| Sewer | 5 | 3 | 2 | 2 |
| Sewerage | 8 | 4 | 4 | 3 |
| Subterrane | 10 | 6 | 4 | 3 |
| Subterranean | 12 | 7 | 5 | 4 |
| Subterraneous | 13 | 7 | 6 | 5 |
| Subway | 6 | 4 | 2 | 2 |
| Trap | 4 | 3 | 1 | 1 |
| Tube | 4 | 2 | 2 | 1 |
| Tunnel | 6 | 4 | 2 | 2 |
| Ulterior | 8 | 4 | 4 | 4 |
| Underground | 11 | 7 | 4 | 3 |
| Warren | 6 | 4 | 2 | 2 |

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