Strong's G2519 — καθηγητής (noun)
kathegetes (kath-ayg-ay-tace') n.
1. a leader or guide, as one who instructs in the way one should go
2. (figuratively) an instructor or rabbi
3. one who starts, establishes, or institutes
{most often used in the context of instruction}
[from a compound of G2596 and G2233]
KJV: master 
Root(s): G2596, G2233 
Compare: G4461 
Hebrew root: ἡγέομαι
Occurrences: 2