Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
συνεταίρω σου your companion LXX.Judg.15.2
συνεταίρω his male companion LXX.Judg.15.6

Liddell-Scott-Jones

συνέταιρος (sunetairos) a male companion G:N-M

συνέταιρος-ος, ,

companion, partner, comrade, [LXX+7th c.BC+]: feminine συνεταιρ-ίς, ίδος, [LXX+1st c.AD+]

LSJ Scripture Refs: LXX.Judg.15.2LXX.Dan.2.17LXX.Judg.11.37