Strong's #4961: sustratiotes (pronounced soos-trat-ee-o'-tace)
from 4862 and 4757; a co-campaigner, i.e. (figuratively) an associate in Christian toil:--fellowsoldier.
Thayer's Greek Lexicon:
́
sustratiōtēs
1) a fellow soldier
2) an associate in labours and conflicts for the cause of Christ
Part of Speech: noun masculine
Relation: from G4862 and G4757
Citing in TDNT: 7:701, 1091
Usage:
This word is used 2 times:
Philippians 2:25: "and companion in labor, and fellow soldier, but your messenger, and"
Philemon 1:2: "and Archippus our fellow soldier, and to the church in"