eye blink vs nictation

eye blink and nictation both are nouns.

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

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

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

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

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