1: βλασφημία
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(Strong's #988 — Noun Feminine — blasphemia — blas-fay-me'-ah )

is translated "evil speaking" in Ephesians 4:31 , AV (RV, "railing"). See BLASPHEMY.

2: καταλαλιά
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(Strong's #2636 — Noun Feminine — katalalia — kat-al-al-ee'-ah )

"evil speaking," 1—Peter 2:1; see BACKBITING.