Strong's G4904 — συνεργός (adjective)
sunergos (soon-er-gos') adj.
1. a co-laborer, i.e. coadjutor
[from a presumed compound of G4862 and the base of G2041]
KJV: companion in labour, (fellow-)helper(-labourer, -worker), labourer together with, workfellow 
Root(s): G4862, G2041 
Hebrew root: ἔργον
Occurrences: 13