shrinkage vs shrinking

shrinkage and shrinking both are nouns.

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

As nouns, shrinkage and shrinking are synonyms defined as:

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