The other words are Reconciliation and Forgiveness. I shall be briefer with them.
Reconciliation. Here the picture is of man as an enemy of God, who becomes reconciled to him, at peace with him, no more at war with him. Nowhere is it ever said that God is reconciled to us. We are the rebellious ones, we are the warring ones, we are the ones who are reconciled through Christ. This figure ought to be particularly interesting to Friends, because Reconciliation, in Paul's usage, is nothing but stopping the state of war with God and coming to peace with Him.
Paul makes his meaning very clear, Romans, Chapter 5, verse 10:
"While we were enemies we were reconciled to God."
The first verse of Chapter 5 says:
"Being justified (that is, acquitted) by faith, we have peace with God through our Lord Jesus Christ."
And then in the eleventh verse he says, "Through whom we have now received the reconciliation." So that you can see that Paul has no technical meaning for Justification and Reconciliation. He uses the terms interchangeably—simply two different pictures of his new state.
Forgiveness. Here the man is a debtor. The idea of sin as a debt is a very old one, very common in Hebrew religion, perhaps because of their commercial instincts. In the Lord's prayer it is said, "Forgive us our debts." You remember, too, that passage in the Epistle to the Philippians, where Paul uses technical commercial terms playfully to indicate that the Philippians had paid their debt to him. Paul often uses this expression, but there is an especially vivid picture in Colossians, Chapter 2, verses 13, 14:
"You were dead in sins and he has given you life, forgiving your sins. The bond which was in force against us he blotted out and cancelled, nailing it to the cross."
That cannot be anything but a metaphorical use, and I am sure that primarily this is what Paul meant by forgiveness: Our debt is cancelled.
And so we lose many theological ideas but we get a picture of Paul, the liberated slave, the adopted son, the acquitted prisoner, the enemy brought to peace, the forgiven debtor, and that is what Paul wanted.