unjust vs fairness

unjust is not a noun while fairness is a noun.

Word	Noun	Adjective	Verb	Adverb
unjust	No	Yes	No	No
fairness	Yes	No	No	No

unjust (noun)	fairness (noun)
	conformity with rules or standards
	the property of having a naturally light complexion
	the quality of being good looking and attractive
	ability to make judgments free from discrimination or dishonesty

unjust (adjective)	fairness (adjective)
violating principles of justice
not equitable or fair
not fair; marked by injustice or partiality or deception