ἔκδικος ekdikos — 2 Occurrences
Romans 13:4 - Adj-NMS
GRK:διάκονός ἐστιν ἔκδικος εἰς ὀργὴν
NAS: of God, an avenger who brings wrath
KJV: of God, a revenger to [execute] wrath
INT: a servant he is an avenger for wrath
1 Thessalonians 4:6 - Adj-NMS
GRK:αὐτοῦ διότι ἔκδικος Κύριος περὶ
NAS: the Lord is [the] avenger in all
KJV: that the Lord [is] the avenger of
INT: of him because avenging [is] [the] Lord concerning