Strong's G2637 — κατάλαλος (adjective)
katalalos (kat-al'-al-os) adj.
1. talkative against, i.e. a slanderer
[from G2596 and the base of G2980]
KJV: backbiter 
Root(s): G2596, G2980 
Hebrew root: λαλέω
Occurrences: 1