heteroliteral

het·er·o·lit·er·al

(het'ĕr-ō-lit'ĕr-ăl), Substitution of one letter for another in the pronunciation of certain words. [hetero- + L. littera, letter]

heteroliteral

(hĕt″ĕr-ō-lĭt′ĕr-ăl) In speaking, pert. to an incorrect letter being substituted for the correct one.