parole vs unloose

parole is a noun but unloose is not a noun.

Word	Noun	Adjective	Verb	Adverb
parole	Yes	No	Yes	No
unloose	No	No	Yes	No

As verbs, unloose is a hypernym of parole; that is, unloose is a word with a broader meaning than parole:

Other hypernyms of parole include free, liberate, loose, release, unloosen.

parole (noun)	unloose (noun)
(law) a conditional release from imprisonment that entitles the person to serve the remainder of the sentence outside the prison as long as the terms of release are complied with
a promise
a secret word or phrase known only to a restricted group

parole (verb)	unloose (verb)
release a criminal from detention and place him on parole	loosen the ties of
	grant freedom to; free from confinement