| borehole(noun, depression, hollow, dent, cavity) |
| bowl(noun, depression, hollow, dent, cavity) |
| breach(noun, opening, hole, aperture, perforation) |
| break(noun, opening, hole, aperture, perforation) |
| breech(noun, bottom, behind, booty, backside) |
| brickbat(noun, cut, dig, affront, dart) |
| bum(noun, bottom, behind, booty, backside) |
| buns(noun, bottom, behind, booty, backside) |
| burrow(noun, depression, hollow, dent, cavity) |
| caboose(noun, bottom, behind, booty, backside) |
| can(noun, bottom, behind, booty, backside) |
| catcall(noun, cut, dig, affront, dart) |
| cavern(noun, depression, hollow, dent, cavity) |
| chaos(noun, dump, shambles, sty, pigsty) |
| chasm(noun, depression, hollow, dent, cavity) |
| cheeks(noun, bottom, behind, booty, backside) |
| chink(noun, opening, hole, aperture, perforation) |
| chuckhole(noun, depression, hollow, dent, cavity) |
| clutter(noun, dump, shambles, sty, pigsty) |
| concavity(noun, depression, hollow, dent, cavity) |