cornerstone

noun 0.688

stepping stone

noun 0.634

standing stone

noun 0.610

stone

noun 0.599

landmark

noun 0.595

etalon

noun 0.589

keystone

noun 0.586

fieldstone

noun 0.569

point of reference

noun 0.566

yardstick

noun 0.562

boundstone

noun 0.561

milestone

noun 0.555

stumbling stone

noun 0.551

gemstone

noun 0.545

hallmark

noun 0.543

floatstone

noun 0.542

benchmark

noun 0.542

criterion

noun 0.538

headstone

noun 0.534

footstone

noun 0.533

capstone

noun 0.532

flagstone

noun 0.528

millstone

noun 0.525

guidepost

noun 0.523

touchpoint

noun 0.523

stamp

noun 0.521

stonewall

noun 0.520

basis

noun 0.518

standard

noun 0.518

waymark

noun 0.518

fulcrum

noun 0.516

crucible

noun 0.515

chockstone

noun 0.514

talisman

noun 0.513

touch-tone

noun 0.513

imposing stone

noun 0.513

tombstone

noun 0.512

anchor

noun 0.512

test

noun 0.512

sunstone

noun 0.510

turnstone

noun 0.509

turning point

noun 0.509

point

noun 0.509

mainstay

noun 0.507

inkstone

noun 0.506

standpoint

noun 0.505

beacon

noun 0.504

bedrock

noun 0.504

gold standard

noun 0.504

grindstone

noun 0.503

whetstone

noun 0.503

staple

noun 0.501

precious stone

noun 0.501

reference

noun 0.501