nictitation vs wink

nictitation and wink both are nouns.

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

As nouns, nictitation and wink are synonyms defined as:

Other synonyms of nictitation include blink, blinking, eye blink, nictation, winking.

nictitation (noun)	wink (noun)
a reflex that closes and opens the eyes rapidly	a reflex that closes and opens the eyes rapidly
	closing one eye quickly as a signal
	a very short time (as the time it takes the eye to blink or the heart to beat)

nictitation (verb)	wink (verb)
	briefly shut the eyes
	keep back by blinking
	signal by winking
	gleam or glow intermittently