justice vs natural virtue

justice and natural virtue both are nouns.

Word	Noun	Adjective	Verb	Adverb
justice	Yes	No	No	No
natural virtue	Yes	No	No	No

As nouns, natural virtue is a hypernym of justice; that is, natural virtue is a word with a broader meaning than justice:

justice: the quality of being just or fair
natural virtue: (scholasticism) one of the four virtues (prudence, justice, fortitude, and temperance) derived from nature

Other hypernyms of justice include righteousness.

justice (noun)	natural virtue (noun)
judgment involved in the determination of rights and the assignment of rewards and punishments	(scholasticism) one of the four virtues (prudence, justice, fortitude, and temperance) derived from nature
the quality of being just or fair
a public official authorized to decide questions brought before a court of justice