antiprism

noun 0.691

hexagonal prism

noun 0.685

crystal

noun 0.612

pyramid

noun 0.592

refractor

noun 0.590

perspex

noun 0.587

lens

noun 0.583

plexiglass

noun 0.580

kaleidoscope

noun 0.569

perspective glass

noun 0.557

prison

noun 0.555

pry

noun 0.548

glass

noun 0.545

prill

noun 0.544

grism

noun 0.543

pram

noun 0.541

trapezoid

noun 0.540

pyramidal

noun 0.537

spectrum

noun 0.535

refractometer

noun 0.534

refraction

noun 0.534

priss

noun 0.533

prong

noun 0.532

pyrex

noun 0.530

primate

noun 0.529

square pyramid

noun 0.529

periscope

noun 0.527

prim

noun 0.526

protractor

noun 0.524

triangular pyramid

noun 0.524

paradigm

noun 0.523

trihedron

noun 0.522

triangle

noun 0.519

tetrahedron

noun 0.519

bipyramid

noun 0.515

spyglass

noun 0.511

parabola

noun 0.510

shape

noun 0.510

reflector

noun 0.508

sphere

noun 0.508

rhombus

noun 0.507

convex lens

noun 0.507

perspective

noun 0.506

prang

noun 0.506

frustum

noun 0.504

visor

noun 0.503

windowpane

noun 0.503

vision

noun 0.502

plex

noun 0.501

iris

noun 0.501

pendulum

noun 0.501