souterrain

noun 0.658

underground

noun 0.623

basement

noun 0.598

cellar

noun 0.596

underpass

noun 0.595

underworld

noun 0.593

crawlway

noun 0.587

crawl space

noun 0.584

cloister

noun 0.571

underneath

noun 0.567

hypogeum

noun 0.564

undercarriage

noun 0.560

oubliette

noun 0.557

underfloor

noun 0.556

cavern

noun 0.554

cryptoporticus

noun 0.553

storm cellar

noun 0.547

subfloor

noun 0.547

sepulchre

noun 0.542

cellarage

noun 0.542

understory

noun 0.539

downstairs

noun 0.538

columbarium

noun 0.537

grotto

noun 0.534

burial chamber

noun 0.531

underbody

noun 0.528

undersection

noun 0.528

underbelly

noun 0.526

beer cellar

noun 0.524

ground floor

noun 0.524

courtyard

noun 0.524

croft

noun 0.522

underwood

noun 0.522

underside

noun 0.520

underfoot

noun 0.519

bunker

noun 0.517

churchyard

noun 0.516

culvert

noun 0.516

underpart

noun 0.515

underclothing

noun 0.513

narthex

noun 0.513

cockloft

noun 0.511

cave

noun 0.511

covered way

noun 0.511

sacristy

noun 0.511

attic

noun 0.511

cortile

noun 0.508

undercoat

noun 0.507

cubbyhole

noun 0.506

counterfort

noun 0.505

undersurface

noun 0.505

wine cellar

noun 0.504

crevice

noun 0.503

undercut

noun 0.503

subbase

noun 0.503

underlay

noun 0.502

vault

noun 0.502

crypt

noun 0.501

architrave

noun 0.501

crouch

noun 0.500