flinch vs shrink

flinch and shrink both are nouns.

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

As verbs, flinch and shrink are synonyms defined as:

Other synonyms of flinch include cringe, funk, quail, recoil, squinch, wince.

flinch (noun)	shrink (noun)
a reflex response to sudden pain	a physician who specializes in psychiatry

flinch (verb)	shrink (verb)
draw back, as with fear or pain	become smaller or draw together
	reduce in size; reduce physically
	wither, as with a loss of moisture
	decrease in size, range, or extent
	draw back, as with fear or pain