flash vs flicker

flash and flicker both are nouns.

Word	Noun	Adjective	Verb	Adverb
flash	Yes	Yes	Yes	No
flicker	Yes	No	Yes	No

As nouns, flicker is a hyponym of flash; that is, flicker is a word with a more specific, narrower meaning than flash:

Other hyponyms of flash include glint, spark, gleam, gleaming, glimmer, coruscation, glitter, sparkle, heat flash, lightning, streak.

As verbs, flicker is a hyponym of flash; that is, flicker is a word with a more specific, narrower meaning than flash:

Other hyponyms of flash include flick.

flash (noun)	flicker (noun)
a lamp for providing momentary light to take a photograph	the act of moving back and forth
a bright patch of color used for decoration or identification	North American woodpecker
a momentary brightness	a momentary flash of light
a sudden brilliant understanding
a short news announcement concerning some on-going news story
a burst of light used to communicate or illuminate
a gaudy outward display
a sudden intense burst of radiant energy
a short vivid experience
a very short time (as the time it takes the eye to blink or the heart to beat)

flash (adjective)	flicker (adjective)
tastelessly showy

flash (verb)	flicker (verb)
appear briefly	move back and forth very rapidly
emit a brief burst of light	flash intermittently
make known or cause to appear with great speed	shine unsteadily
protect by covering with a thin sheet of metal
run or move very quickly or hastily
gleam or glow intermittently
display proudly; act ostentatiously or pretentiously
expose or show briefly