parole vs arcanum

parole and arcanum both are nouns.

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

As nouns, arcanum is a hypernym of parole; that is, arcanum is a word with a broader meaning than parole:

Other hypernyms of parole include secret, positive identification.

parole (noun)	arcanum (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	information known only to a special group
a promise
a secret word or phrase known only to a restricted group

parole (verb)	arcanum (verb)
release a criminal from detention and place him on parole