Good Question! 😇
A- FAIRNESS ( adjective:- fairer , fairest) :- agreeing with what is thought to be right or acceptable..
I show you some example..
1- We received fair treatment.
2- I washed the dishes yesterday, so it's only fair (that) you to do them today.
3- a fair fight
B- JUSTICE ( plural Justice) :- the process or result of using laws to fairly judge and punish crimes and criminals...
I show you some example...
1. The U.S. Department of Justice.
2. Criminals attempting to escape justice.
3. They received justice in court.
I hope it's help 😇.