συστρατιώτηςsystratiṓtēs
GreekG49612 occurrences (KJV)
a co-campaigner, i.e. (figuratively) an associate in Christian toil
KJV renders it: fellowsoldier
Where it appears
Lexical data: Strong’s Hebrew & Greek Dictionaries (1890, public domain; openscriptures, CC-BY-SA). Word tagging from the Strong’s-numbered KJV.