Strong's G2418 — ἱερουργέω (verb)
hierourgeo (hee-er-ourg-eh'-o) v.
1. to be a temple-worker, i.e. officiate as a priest (figuratively)
[from a compound of G2411 and the base of G2041]
KJV: minister 
Root(s): G2411, G2041 
Hebrew root: ἔργον
Occurrences: 1