wink vs flicker

wink and flicker both are nouns.

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

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

Other hyponyms of wink include flick.

wink (noun)	flicker (noun)
a reflex that closes and opens the eyes rapidly	the act of moving back and forth
closing one eye quickly as a signal	North American woodpecker
a very short time (as the time it takes the eye to blink or the heart to beat)	a momentary flash of light

wink (verb)	flicker (verb)
briefly shut the eyes	move back and forth very rapidly
keep back by blinking	flash intermittently
signal by winking	shine unsteadily
gleam or glow intermittently