unchain vs chain

unchain is not a noun while chain is a noun.

Word	Noun	Adjective	Verb	Adverb
unchain	No	No	Yes	No
chain	Yes	No	Yes	No

unchain (noun)	chain (noun)
	a series of (usually metal) rings or links fitted into one another to make a flexible ligament
	a necklace made by stringing objects together
	anything that acts as a restraint
	a linked or connected series of objects
	a series of things depending on each other as if linked together
	(business) a number of similar establishments (stores or restaurants or banks or hotels or theaters) under one ownership
	(chemistry) a series of linked atoms (generally in an organic molecule)
	a series of hills or mountains
	a unit of length

unchain (verb)	chain (verb)
remove the chains from	fasten or secure with chains
make free	connect or arrange into a chain by linking