| mine(noun, well, hole, hollow, pit) |
| mouth(noun, opening, breach, hole, gap) |
| orbital |
| outlet(noun, break, cut, crack, opening) |
| perforation(noun, break, cut, crack, breach) |
| puncture(well, hole, hollow) |
| ravine(noun, break, opening, breach, void) |
| rupture(noun, break, opening, breach, hole) |
| scoop(noun, break, cut, crack, score) |
| shell(noun, pattern, frame, template) |
| sink(noun, depression, impression, dip, hollow) |
| slit(noun, break, opening, breach, hole) |
| slot(noun, break, retreat, opening, breach) |
| tear(noun, breach, hole, gap) |
| vent(noun, break, cut, crack, opening) |
| wadi |
| yawn |
| alcove(noun, break, retreat, space, box) |
| alveolation |
| angle |