retract vs flinch

retract is not a noun while flinch is a noun.

Word	Noun	Adjective	Verb	Adverb
retract	No	No	Yes	No
flinch	Yes	No	Yes	No

As verbs, flinch is a hypernym of retract; that is, flinch is a word with a broader meaning than retract:

Other hypernyms of retract include cringe, funk, quail, recoil, shrink, squinch, wince.

retract (noun)	flinch (noun)
	a reflex response to sudden pain

retract (verb)	flinch (verb)
formally reject or disavow a formerly held belief, usually under pressure	draw back, as with fear or pain
pull inward or towards a center
use a surgical instrument to hold open (the edges of a wound or an organ)
pull away from a source of disgust or fear