unfairness vs actus reus

unfairness and actus reus both are nouns.

Word	Noun	Adjective	Verb	Adverb
unfairness	Yes	No	No	No
actus reus	Yes	No	No	No

As nouns, actus reus is a hypernym of unfairness; that is, actus reus is a word with a broader meaning than unfairness:

Other hypernyms of unfairness include misconduct, wrongdoing, wrongful conduct.

unfairness (noun)	actus reus (noun)
an unjust act	activity that transgresses moral or civil law
injustice by virtue of not conforming with rules or standards
partiality that is not fair or equitable