eye blink vs nictitation

eye blink and nictitation both are nouns.

Word	Noun	Adjective	Verb	Adverb
eye blink	Yes	No	No	No
nictitation	Yes	No	No	No

As nouns, eye blink and nictitation are synonyms defined as:

eye blink and nictitation: a reflex that closes and opens the eyes rapidly

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

eye blink (noun)	nictitation (noun)
a reflex that closes and opens the eyes rapidly	a reflex that closes and opens the eyes rapidly