shrink vs shrinkage

shrink and shrinkage both are nouns.

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

shrink (noun)	shrinkage (noun)
a physician who specializes in psychiatry	the act of stealing goods that are on display in a store
	the amount by which something shrinks
	process or result of becoming less or smaller

shrink (verb)	shrinkage (verb)
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