lightspeed

noun 0.802

speed of sound

noun 0.784

speed

noun 0.701

velocity

noun 0.658

light year

noun 0.648

speed limit

noun 0.644

high speed

noun 0.635

speed parameter

noun 0.632

wind speed

noun 0.621

visible light

noun 0.614

wire speed

noun 0.603

wavelength

noun 0.595

white light

noun 0.590

light

noun 0.585

speediness

noun 0.580

celerity

noun 0.564

special relativity

noun 0.560

space velocity

noun 0.559

light spectrum

noun 0.556

sunlight

noun 0.553

group velocity

noun 0.548

speeding

noun 0.548

luminosity

noun 0.546

luminous intensity

noun 0.546

fast

noun 0.544

lightness

noun 0.544

swiftness

noun 0.542

speedometer

noun 0.541

electric light

noun 0.538

superspeed

noun 0.537

sound wave

noun 0.537

lightning

noun 0.535

sound barrier

noun 0.528

theory of relativity

noun 0.526

red light

noun 0.525

instantaneous velocity

noun 0.522

speedster

noun 0.521

speed camera

noun 0.521

faster

noun 0.521

luminance

noun 0.520

visible spectrum

noun 0.518

escape velocity

noun 0.514

lighting

noun 0.514

quickness

noun 0.514

photon

noun 0.514

electromagnetic wave

noun 0.514

electric current

noun 0.513

muzzle velocity

noun 0.512

phase velocity

noun 0.512

green light

noun 0.510

airspeed

noun 0.509

electromagnetic radiation

noun 0.508

spacetime

noun 0.507

metre per second

noun 0.506

instantaneity

noun 0.506

dark energy

noun 0.505

ultraviolet light

noun 0.505

frequency

noun 0.504

brightness

noun 0.503

radio wave

noun 0.502

rapidity

noun 0.502

starlight

noun 0.501

principle of relativity

noun 0.500