hold back vs blink

hold back is not a noun while blink is a noun.

Word	Noun	Adjective	Verb	Adverb
hold back	No	No	Yes	No
blink	Yes	No	Yes	No

As verbs, blink is a hyponym of hold back; that is, blink is a word with a more specific, narrower meaning than hold back:

hold back (noun)	blink (noun)
	a reflex that closes and opens the eyes rapidly

hold back (verb)	blink (verb)
prevent the action or expression of	briefly shut the eyes
hold back, as of a danger or an enemy; check the expansion or influence of	keep back by blinking
hold back; keep from being perceived by others	gleam or glow intermittently
secure and keep for possible future use or application
wait before acting
refrain from doing