Strong’s Greek
G1517 — eirenopoieo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
εἰρηνοποιέω
eirenopoieo — pronounced i-ray-nop-oy-eh'-o
from 1518; to be a peace-maker, i.e. (figuratively) to harmonize:--make peace. see GREEK for 1518
1 occurrence in the KJV.
Colossians 1:20
And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven.