Synonyms of sinkhole

1 Syllable
dip, sink, sag, dent, bowl, pit, hole, scoop, void
2 Syllables
dimple, downtrend, falloff, crater, vacuum, pocket, washbowl, fall-off, basin, basins, valley, hollow
3 Syllables
vacuity, aquifer, aquifers, impression, washbasin, sinkage
4 Syllables
concavity, excavation, indentation