cavern

noun 0.674

cave

noun 0.668

grove

noun 0.633

cove

noun 0.584

gully

noun 0.572

crevice

noun 0.563

groove

noun 0.557

alcove

noun 0.552

gutter

noun 0.545

grotesque

noun 0.544

caving

noun 0.544

underground

noun 0.543

gargoyle

noun 0.539

grotesquery

noun 0.536

undercroft

noun 0.534

cenote

noun 0.533

gorge

noun 0.531

gazebo

noun 0.531

crag

noun 0.531

troglodyte

noun 0.530

souterrain

noun 0.530

caver

noun 0.530

geyser

noun 0.529

sinkhole

noun 0.528

goblin

noun 0.526

grouch

noun 0.523

groyne

noun 0.522

hypogeum

noun 0.520

stalagmite

noun 0.520

gulch

noun 0.517

tunnel

noun 0.516

lagoon

noun 0.516

grommet

noun 0.516

sulcus

noun 0.515

cave in

noun 0.513

graveyard

noun 0.513

rockery

noun 0.512

hideout

noun 0.511

garden

noun 0.511

blue hole

noun 0.511

grog

noun 0.511

nymphaeum

noun 0.511

ghat

noun 0.509

geode

noun 0.509

gable

noun 0.509

quarry

noun 0.509

rockpool

noun 0.508

lacune

noun 0.508

hovel

noun 0.507

crawlway

noun 0.507

olive grove

noun 0.507

burrow

noun 0.506

pergola

noun 0.506

nook

noun 0.506

dugout

noun 0.506

trench

noun 0.506

lair

noun 0.506

canyon

noun 0.505

fossa

noun 0.505

graffito

noun 0.505

tomb

noun 0.505

groat

noun 0.505

oubliette

noun 0.505

grout

noun 0.504

cubbyhole

noun 0.504

cranny

noun 0.503

cave dweller

noun 0.503

cavity

noun 0.503

geocache

noun 0.503

gabbro

noun 0.503

cloister

noun 0.502

bunker

noun 0.501

gourd

noun 0.500