downsize vs shrink

downsize is not a noun while shrink is a noun.

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

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

Other hypernyms of downsize include reduce.

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

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