softback

noun 0.627

flatback

noun 0.627

hogback

noun 0.615

camelback

noun 0.612

hardback

noun 0.602

shellback

noun 0.585

saddleback

noun 0.576

box turtle

noun 0.575

canvasback

noun 0.558

whaleback

noun 0.557

back cover

noun 0.542

switchback

noun 0.538

leatherback

noun 0.538

ladderback

noun 0.537

halfback

noun 0.534

hardtop

noun 0.530

hardcover

noun 0.527

turtle

noun 0.526

linebacker

noun 0.526

diamondback terrapin

noun 0.521

backpack

noun 0.520

diamondback

noun 0.517

backness

noun 0.517

tailboard

noun 0.517

daypack

noun 0.517

bookbag

noun 0.516

backward

noun 0.514

back

noun 0.513

turtleneck

noun 0.512

back straight

noun 0.512

tailback

noun 0.511

muleback

noun 0.510

handspring

noun 0.510

tumblehome

noun 0.510

humpback

noun 0.507

bobtail

noun 0.507

fastback

noun 0.506

touchback

noun 0.505

turtling

noun 0.505

ringback

noun 0.505

strongback

noun 0.503

tuck

noun 0.503

tortoise shell

noun 0.502

loggerhead

noun 0.500

horseback

noun 0.500