justiciar vs justice

justiciar and justice both are nouns.

Word	Noun	Adjective	Verb	Adverb
justiciar	Yes	No	No	No
justice	Yes	No	No	No

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

justiciar: formerly a high judicial officer
justice: a public official authorized to decide questions brought before a court of justice

Other hypernyms of justiciar include judge, jurist.

justiciar (noun)	justice (noun)
formerly a high judicial officer	judgment involved in the determination of rights and the assignment of rewards and punishments
	the quality of being just or fair
	a public official authorized to decide questions brought before a court of justice