| colliery(noun, shaft, mine, pit, seam) |
| coal mine(expression, idiom) |
| pit(noun, shaft, seam, excavation, coalfield) |
| quarry(noun, shaft, pit, seam, excavation) |
| abundance(noun, pit, excavation, coalfield) |
| bed(noun, pit, excavation, coalfield) |
| bonanza(noun, pit, excavation, coalfield) |
| cavity |
| coal pit(expression, idiom) |
| coalface(noun, shaft, mine, pit, seam) |
| coalfield(noun, pit, seam, excavation) |
| deposit(noun, pit, excavation, coalfield) |
| ditch(noun, pit, excavation, coalfield) |
| endocarp |
| excavation(noun, shaft, pit, seam, coalfield) |
| field(noun, pit, excavation, coalfield) |
| fossa |
| fount(noun, pit, excavation, coalfield) |
| fountain(noun, pit, excavation, coalfield) |
| fund(noun, pit, excavation, coalfield) |