SINKHOLES
Scrabble letter values: S1I1N1K5H4O1L1E1S1 = 16
Definition
SINKHOLES is the plural of SINKHOLE.
noun SINKHOLE: a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof.
Synonyms of SINKHOLE: sink, swallow_hole