retract vs shrink

retract is not a noun while shrink is a noun.

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

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

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

retract (noun)	shrink (noun)
	a physician who specializes in psychiatry

retract (verb)	shrink (verb)
formally reject or disavow a formerly held belief, usually under pressure	become smaller or draw together
pull inward or towards a center	reduce in size; reduce physically
use a surgical instrument to hold open (the edges of a wound or an organ)	wither, as with a loss of moisture
pull away from a source of disgust or fear	decrease in size, range, or extent
	draw back, as with fear or pain