nictation vs eye blink

nictation and eye blink both are nouns.

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

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

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

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

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