| burrow(noun, verb, nature, animal, break) |
| hole(noun, verb, nature, opening, beam) |
| mine(noun, verb, hurt, ruin, destroy) |
| den(noun, nature, break, cut, crack) |
| dig(noun, verb, hurt, ruin, destroy) |
| excavate(verb, cut, hurt, ruin, destroy) |
| shaft(noun, break, cut, line, crack) |
| adit(noun, opening, conduit, access, passageway) |
| bore(verb, turn, produce, clean, discover) |
| cave(noun, nature) |
| channel(noun, verb, turn, produce, clean) |
| passage(noun, opening, conduit, passageway) |
| tube(noun, opening, conduit, passageway, hose) |
| sap(verb, hurt, ruin, destroy, turn) |
| underpass(noun, expression, passageway, ffgg) |
| gouge(noun, verb, cut, turn, produce) |
| penetrate(verb, turn, produce, clean, discover) |
| subway(noun, passageway) |
| cavern |
| cove |