Synonyms for Flash:

adj.

all (adjective)
gaudy, garish, gimcrack, tatty, flashy, loud, cheap, brassy, tawdry, meretricious, tacky, trashy.

n.

burst, glare, commit, glimmer, vision, spark, glance, extort, ray, flicker, display, imprint, abduct, commission, streak, dazzle, defraud, abet, shimmer, coruscation, phosphorescence, bootleg, impulse, pencil, reflection, case, blackmail, stream, counterfeit, glisten. fast, glister, straight away, right now, promptly, headlong, coruscate, suddenly, spangle, on-the-spot, straight, instantly, at once. commitment, faith, idea, thought, principle, ideal, philosophy, concept, continue, theory, belief. bolt, pelt, rocket, whiz, festinate, trot, bucket, let someone know, whirl, give someone to understand (that), sprint, deliver, fly, move, sail, point out, nip, relay, advise, hurry, speed, tell, scour, zoom, rip, zip, hustle, whisk, hotfoot, highball, wing, barrel, run, bustle, divulge, rush, hasten, race. brandish, parade, show, disport, flick, exhibit, energize, engage, eject, sport, activate, crank, coax, actuate, expose, control. digicam, developer, aperture, darkroom, camcorder, camera, cartridge, Asa, celluloid, boom. emergence, resurface, loom, appearance, take shape, reappear, rear its (ugly) head, appear. extravagant, costly, pricey, luxurious, expensive, sumptuous, high-class, exclusive, select. flush, spurt, outburst, fit, twinge, spasm. gallop, surge, be quick on your feet, outpace. catch the light. radiance. hubris, swagger, one-upmanship, flamboyance, grandstanding, pretension, self-promotion, boast. flamboyant, boastful, ostentatious, grandly, dramatic, BLING, grand, bombastic, trophy. come and go, spring up, break through, spring, emerge, erupt, pop up, descend on, shoot up, crop up. creep, express, cross, crease, falter, crumple, furrow, clear. occupy, occur to, strike, go through, cross someone's mind, think, enter your mind/head, dawn. beam (noun)
ray.
demonstration (noun)
swank, display.
flash (noun)
flare, photoflash, jiffy, flashbulb, swank, twinkling, loud, dash, flaunt, flashy, gimcrack, blink of an eye, brassy, scoot, in poor taste, trice, newsflash, tatty, garish, shoot, flash lamp, dart, twinkle, ostentate, wink, tasteless, winkle, blink, cheap, tacky, instant, new york minute, split second, trashy, flashing, meretricious, gaudy, tawdry, news bulletin, flashgun, scud.
in a flash (noun)
expensive, gaudy, ostentatious.
instant, split second (noun)
jiffy, show, trice, outburst.
light (noun)
beam, incandescence, illumination, luminousness, glow, scintillation, shine, light, brilliance, lucidity, brightness, radiation, gleam, luster, sparkle, blaze, glint, glitter.
news (noun)
communication, information, news, bulletin, message, dispatch, gossip, rumor, notice, announcement, report, statement, account, release, epistle.
ostentation (noun)
flamboyance.
publication (noun)
release.
shimmer, flicker (noun)
radiation, blaze, burst, glint, gleam, glimmer, glitter, vision, glare, twinkle, illumination, twinkling, imprint, streak, phosphorescence, shine, glow, reflection, sparkle, flare, glance, impulse, incandescence, scintillation, stream, coruscation, spark, dazzle, ray, beam, luster, glisten.
split second (noun)
blink of an eye.
suddenness (noun)
immediacy, suddenness, instantaneousness, heartbeat, trice, quickness, twinkling, haste.

v.

light (verb)
fluoresce, fire, radiate, incandesce, flood, spot, illuminate, flare, scintillate.
move fast and display (verb)
dash, flaunt, parade, dart, fly, disport, expose, spring, race, brandish, speed, zoom, bolt, shoot, exhibit.
perception (verb)
blink, wink, winkle, twinkle.
shimmer, flicker (verb)
light, scintillate, radiate, coruscate, blink, incandesce, spangle.

Other synonyms:

New York minute
new york minute.
emerge, one-upmanship, actuate, reappear, self-promotion, hubris, flush, boastful, coruscation, coruscate, grandly, ostentatious, activate, occur to, loom, bombastic, camera, festinate, grandstanding, color scheme, flick, coax, eject, radiance, glister. contrast, flamboyant, crumple, highball, BLING, twinge, expose, engage, rush, exhibit, energize, impulse, appearance, crank, whisk, disport, emergence, boast, trophy, dazzle, rocket, chromatic, pretension, resurface, swagger, control, bustle, zoom, discoloration, hotfoot. stream, sail, bolt, rip, coloring, creep, falter, sprint, hasten, brandish. dawn, surge, dramatic, bucket, whiz, grand. hustle, parade, nip, furrow, crease, hurry, whirl. appear, display, occupy. fly, run, show. think. color, depth, go through. fit, express. cross. strike. clear. glimpse
glance.
glisten
glisten.
glitter
spark.
reveal
expose.
shine
glisten.
zoom
shoot up.

Usage examples for flash

  1. " It had to do with the flash – Recalled to Life by Grant Allen
  2. My eyes can flash fire, and his can't. – The Patchwork Girl of Oz by L. Frank Baum
  3. He's the best I have by a long way, although some people prefer Flash – The Sweep Winner by Nat Gould