1: δικαιοσύνη
(Strong's #1343 — Noun Feminine — dikaiosune — dik-ah-yos-oo'-nay )

is "the character or quality of being right or just;" it was formerly spelled "rightwiseness," which clearly expresses the meaning. It is used to denote an attribute of God, e.g., Romans 3:5 , the context of which shows that "the righteousness of God" means essentially the same as His faithfulness, or truthfulness, that which is consistent with His own nature and promises; Romans 3:25,26 speaks of His "righteousness" as exhibited in the Death of Christ, which is sufficient to show men that God is neither indifferent to sin nor regards it lightly. On the contrary, it demonstrates that quality of holiness in Him which must find expression in His condemnation of sin.

Matthew 5:6,10,20John 16:8,10Matthew 3:1521:32Matthew 6:33Matthew 6:1 Matthew 6:2-4Matthew 6:5-15Matthew 6:16-18James 1:203:182—Peter 1:1Hebrews 5:13Romans 6Ephesians 6:142—Corinthians 5:21Romans 4:3Romans 4:6,11Romans 4:3,5,9,22
2: δικαίωμα
(Strong's #1345 — Noun Neuter — dikaioma — dik-ah'-yo-mah )

is the concrete expression of "righteousness:" see JUSTIFICATION , A, No. 2.

Hebrews 1:8