tufa

noun 0.755

tuffet

noun 0.686

tough

noun 0.646

tufty

noun 0.630

tuft

noun 0.629

tephra

noun 0.601

toughie

noun 0.596

ruff

noun 0.592

pumice

noun 0.584

duff

noun 0.582

puffa

noun 0.567

tussock

noun 0.565

talus

noun 0.562

puff

noun 0.560

guff

noun 0.557

toughness

noun 0.557

tump

noun 0.556

talc

noun 0.554

tunk

noun 0.552

tufting

noun 0.549

rubble

noun 0.542

taffy

noun 0.537

tush

noun 0.535

toff

noun 0.534

tiff

noun 0.534

chert

noun 0.532

puffball

noun 0.530

pouf

noun 0.527

rock

noun 0.527

puffin

noun 0.526

trachyte

noun 0.526

tuck

noun 0.526

chuff

noun 0.526

fluff

noun 0.525

huff

noun 0.522

roughy

noun 0.522

crag

noun 0.520

tug

noun 0.520

scruff

noun 0.519

living rock

noun 0.518

talcum

noun 0.517

ruggedness

noun 0.516

rough

noun 0.516

turd

noun 0.515

tusk

noun 0.514

bedrock

noun 0.513

tar sand

noun 0.512

puffer

noun 0.511

gabbro

noun 0.511

rock face

noun 0.510

tup

noun 0.509

wacke

noun 0.509

tub

noun 0.507

tucker

noun 0.507

tumbler

noun 0.506

granite

noun 0.506

tillite

noun 0.506

rhyolite

noun 0.506

breccia

noun 0.506

tarmac

noun 0.505

fluffy

noun 0.505

mudstone

noun 0.504

tuit

noun 0.504

gutty

noun 0.503

tizz

noun 0.503

tough case

noun 0.503

tass

noun 0.502

tweed

noun 0.502

duffel

noun 0.502

scuff

noun 0.501

schist

noun 0.501