Letter: r
- radar beacon, beacon, beam, marker, pylon, wind sock
- radar navigation, pinpointing, scanning, tracking, triangulation
- radar signal, beam, blips, bounce, display, echo, picture, pip, reading, reflection, return, signal, spot, trace
- radar telescope, observatory, planetarium, radar, reflector, spectrograph, spectroscope, telescope
- radar, altimeter, amplifier, analyser, automatic electronic navigation, automation, avionics, cathode-ray tube, celestial navigation, chronometer, dead reckoning, demodulator, detector, discriminator, electron microscopy, electron optics
- radar-telephone relay, pinpointing, scanning, tracking, triangulation
- radial motion, advance, ascent, backing, career, climbing, course, current, descent, drift, flight, flow, flux, forward motion, mounting, ongoing
- radial, approaching, asymptotic, centripetal, concurrent, confluent, confocal, converging, focal, meeting, mutually approaching, radiate, radiating, tangent, tangential, uniting
- radiance, aura, blare, blaze, blaze of glory, blazing light, blinding light, blitheness, bright light, brightness, brilliance, brilliancy, brilliant light, burst of light, charisma, cheer
- radiant energy, contamination, decontamination, emanation, fallout, half-life, highlight, illumination, irradiation, light, light source, luminous energy, natural radioactivity, nuclear radiation, radiance, radiation
- radiant heat, burning, fever, heating, superheat, warmth
- radiant point, fireball, meteor, radiant, shooting star
- radiant splendour, blare, blaze, brightness, brilliance, flamboyance, glare, glory, radiance, resplendence, splendour
- radiant, ablaze, aglow, alight, all-knowing, all-powerful, all-seeing, all-wise, almighty, arbour, axis, axle, axle bar, axle shaft, axle spindle, axle-tree
- radiate cheer, beam, caper, chirp, dance, frolic, gambol, glow, laugh, lilt, romp, sing, skip, smile, sparkle, whistle
- radiate heat, bake, blaze, bloom, boil, broil, burn, choke, cook, flame, flame up, flare, flare up, flicker, flush, fry
- radiate, be bright, beacon, beam, bedazzle, bestrew, blaze, blind, broadcast, burn, circulate, coruscate, daze, dazzle, deal out, diffract
- radiating, approaching, asymptotic, centripetal, concurrent, confluent, confocal, converging, focal, meeting, mutually approaching, radial, radiate, tangent, tangential, uniting
- radiation physics, acoustics, applied physics, astrophysics, basic conductor physics, biophysics, chemical physics, cryogenics, crystallography, electron physics, electronics, geophysics, mathematical physics, mechanics, natural philosophy, natural science
- radiation sickness, altitude sickness, anthrax, black lung, caisson disease, chilblain, decompression sickness, frostbite, immersion foot, jet lag, lead poisoning, mercury poisoning, motion sickness, red-out, sunstroke, the bends
- radiation, X ray, actinic ray, arc lighting, asteroids, atomic beam, atomic ray, attenuation, aurora particles, beam, beam of light, black and white, blackout, broadcast, broadcasting, chiaroscuro
- radiator, amateur transmitter, beacon, bedpan, brazier, fan marker, forge, geyser, heat lamp, hot-water bottle, infra-red lamp, kiln, microphone, oven, radio beacon, radio range beacon
- radical change, accommodation, adaptation, adjustment, alteration, amelioration, apostasy, betterment, break, breakdown, breakup, cataclysm, catastrophe, change of heart, clean slate, clean sweep
- radical operation, amputation, excision, operation, removal, resection, section, transplant
- radical reform, conversion, extremism, progressivism, radicalism, reform, reformation, regeneration, revisionism, revolution, transformation
- radical right, Tory, conservative, extreme right-winger, hard hat, imperialist, monarchist, reactionary, right, right wing, right-winger, rightist, royalist, ultraconservative
- radical therapy, biofeedback, counselling, encounter therapy, group therapy, hypnosis, hypnotism, marathon, occupational therapy, psychodrama, psychotherapy, sensitivity training, transactional analysis, transcendental meditation
- radical, Bolshevik, Jacobin, aboriginal, absolute, accidence, acid, acidity, advanced, affix, agent, agitator, algorithmic, aliquot, alkali, alkalinity
- radicalism, New Left, abandon, anarchism, boundlessness, conversion, egregiousness, enormousness, exaggeration, excess, excessiveness, exorbitance, extravagance, extreme, extreme left, extreme left wing
- radically, absolutely, all out, beyond all bounds, beyond compare, beyond comparison, beyond measure, completely, dead, downright, essentially, extremely, flat out, fundamentally, immeasurably, in the extreme
