sinkhole

anthracite, boulder, cwm, erratic, igneous, intrusive, mesa, sedimentary, silt, swale

airhole, armhole, atoll, bankroll, beadroll, bedroll, black hole, blackpoll, blowhole, borehole, bunghole, cajole, catchpole, charcoal, chuckhole, condole, console, control, creole, Creole, dipole, drumroll, dry hole, Dutch roll, egg roll, enroll, ensoul, extol, eyehole, field goal, fishbowl, flagpole, foxhole, funk hole, hard coal, half sole, heart-whole, hellhole, Huichol, inscroll, insole, in whole, keyhole, kneehole, knothole, leaf roll, logroll, loophole, manhole, maypole, midsole, Mongol, outsole, parole, patrol, payroll, peephole, pesthole, pinhole, pistole, pitchpole, porthole, posthole, pothole, redpoll, ridgepole, Sheol, shot hole, ski pole, slipsole, snap roll, sotol, sound hole, spring roll, tadpole, taphole, thumbhole, top-hole, touchhole, unroll, washbowl, weep hole, white hole, wormhole