Effable :: Effable (a.) Capable of being uttered or explained; utterable.
Efface :: Efface (v. t.) To cause to disappear (as anything impresses or inscribed upon a surface) by rubbing out, striking out, etc.; to erase; to render illegible or indiscernible; as, to efface the letters on a monument, or the inscription on a coin..
Efface :: Efface (v. t.) To destroy, as a mental impression; to wear away..