| perforation(noun, break, crack, opening) |
| aperture(noun, break, crack, opening) |
| keyhole(noun, break, crack, opening) |
| foramen(noun, break, crack, opening) |
| vent(noun, break, crack, opening) |
| breach(noun, break, crack, opening) |
| cavity(noun, break, crack, opening) |
| chasm(noun, break, crack, opening) |
| chink(noun, break, crack, opening) |
| cleft(noun, break, crack, opening) |
| cranny(noun, break, crack, opening) |
| crater(noun, break, crack, opening) |
| depression(noun, break, crack, opening) |
| dimple(noun, break, crack, opening) |
| dip(noun, break, crack, opening) |
| excavation(noun, break, crack, opening) |
| fissure(noun, break, crack, opening) |
| fracture(noun, break, crack, opening) |
| gap(noun, break, crack, opening) |
| hollow(noun, break, crack, opening) |