substrate

noun 0.691

subbase

noun 0.687

stratum

noun 0.683

substructure

noun 0.677

subsurface

noun 0.658

sublayer

noun 0.619

subgrade

noun 0.601

substance

noun 0.593

fundament

noun 0.586

strata

noun 0.586

subfloor

noun 0.583

basis

noun 0.578

underlayer

noun 0.577

underlay

noun 0.576

superstructure

noun 0.567

underlying

noun 0.565

undersurface

noun 0.557

superstrate

noun 0.554

bedrock

noun 0.551

stratification

noun 0.550

stratus

noun 0.548

underlier

noun 0.546

subsolution

noun 0.546

subsoil

noun 0.543

surface layer

noun 0.542

surface

noun 0.542

subsistence

noun 0.541

basal

noun 0.539

underpinning

noun 0.537

basal layer

noun 0.531

hypostasis

noun 0.530

subsidence

noun 0.526

solum

noun 0.525

submersion

noun 0.521

subframe

noun 0.521

ground

noun 0.519

sub

noun 0.519

soil

noun 0.518

underneath

noun 0.517

basement

noun 0.516

structural

noun 0.515

socle

noun 0.513

understory

noun 0.512

underlying set

noun 0.512

foundation

noun 0.510

underfoot

noun 0.509

layer

noun 0.506

superposition

noun 0.506

platform

noun 0.506

subtradition

noun 0.505

substantial

noun 0.504

stratosphere

noun 0.504

substantive

noun 0.503

roadbase

noun 0.503

subsumption

noun 0.503

sublimit

noun 0.503

suber

noun 0.502

stratum granulosum

noun 0.502

subscript

noun 0.502

roadbed

noun 0.501

underground

noun 0.501

sublimate

noun 0.501

sediment

noun 0.501

supposition

noun 0.501

underplating

noun 0.500