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Blaspheme, Blasphemy, Blasphemer, Blasphemous:

either from blax, "sluggish, stupid," or, probably, from blapto, "to injure," and pheme, "speech," (Eng. "blasphemy") is so translated thirteen times in the RV, but "railing" in Mat 15:19; Mar 7:22; Eph 4:31; Col 3:8; 1Ti 6:4; Jud 1:9. The word "blasphemy" is practically confined to speech defamatory of the Divine Majesty.

Nave's Topical Bible (Reviling, Using Harsh, Insolent, or Vituperative Language; Scoffing)

1Cr 5:11; 1Ti 6:4; 1Pe 3:9; 2Pe 2:11; Jud 1:9

Evil Speaking:

is translated "evil speaking" in Eph 4:31, AV (RV, "railing").
See BLASPHEMY.
2 Strong's Number: 2636 Greek: katalalia
Evil Speaking:

"evil speaking," 1Pe 2:1; See BACKBITING.