release vs parole

release and parole both are nouns.

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

As nouns, parole is a hyponym of release; that is, parole is a word with a more specific, narrower meaning than release:

release: the act of liberating someone or something
parole: (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

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

Other hyponyms of release include unspell, unchain, bail, run, bail out.

release (noun)	parole (noun)
activity that frees or expresses creative energy or emotion	(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
the act of liberating someone or something	a promise
the termination of someone's employment (leaving them free to depart)	a secret word or phrase known only to a restricted group
the act of allowing a fluid to escape
a formal written statement of relinquishment
(music) the act or manner of terminating a musical phrase or tone
merchandise issued for sale or public showing (especially a record or film)
a device that when pressed will release part of a mechanism
an announcement distributed to members of the press in order to supplement or replace an oral presentation
a legal document evidencing the discharge of a debt or obligation
euphemistic expressions for death
a process that liberates or discharges something

release (verb)	parole (verb)
generate and separate from cells or bodily fluids	release a criminal from detention and place him on parole
eliminate (a substance)
make (assets) available
prepare and issue for public distribution or sale
release, as from one's grip
let (something) fall or spill from a container
release (gas or energy) as a result of a chemical reaction or physical decomposition
part with a possession or right
grant freedom to; free from confinement
make (information) available for publication