| Solution | Length | |
|---|---|---|
| 4 letters | ||
| dino | 4 | |
| sill | 4 | |
| root | 4 | |
| seat | 4 | |
| rock | 4 | |
| 5 letters | ||
| wilma | 5 | |
| DINOS | 5 | |
| dogma | 5 | |
| stone | 5 | |
| tower | 5 | |
| scree | 5 | |
| vital | 5 | |
| basis | 5 | |
| 6 letters | ||
| SCORIA | 6 | |
| schist | 6 | |
| rubble | 6 | |
| 7 letters | ||
| radical | 7 | |
| HARDPAN | 7 | |
| subsoil | 7 | |
| 8 letters | ||
| boulders | 8 | |
| rudiment | 8 | |
| 9 letters | ||
| saprolite | 9 | |
| sandstone | 9 | |
| underside | 9 | |
| principle | 9 | |
| 10 letters | ||
| SUBSTRATUM | 10 | |
| UNDERNEATH | 10 | |
| underbelly | 10 | |
| UNDERLAYER | 10 | |
| foundation | 10 | |
| 11 letters | ||
| Rock bottom | 11 | |
| terra firma | 11 | |
| SUBSTANTIVE | 11 | |
| 12 letters | ||
| underpinning | 12 | |
| substructure | 12 | |
| 14 letters | ||
| understructure | 14 | |