nictitation vs eye blink

nictitation and eye blink both are nouns.

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

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

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

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

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