shrink vs downsize

shrink is a noun but downsize is not a noun.

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

As verbs, downsize is a hyponym of shrink; that is, downsize is a word with a more specific, narrower meaning than shrink:

Other hyponyms of shrink include reduce, scale down, reef, miniaturise, miniaturize, depopulate, desolate, contract.

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

shrink (verb)	downsize (verb)
become smaller or draw together	(of a company) reduce in size or number of employees
reduce in size; reduce physically	design or manufacture in a smaller size
wither, as with a loss of moisture	dismiss from work
decrease in size, range, or extent
draw back, as with fear or pain