[ひょうき, hyouki] (n, vs, adj-no) (1) writing on the surface (e.g. an address on an envelope); inscribing on the face; (2) expression in writing; notation; transcription; (P)#378
[ラぎょうへんかくかつよう, ra gyouhenkakukatsuyou] (n) irregular conjugation (inflection, declension) of a limited number of verbs ending in "ru" (in written Japanese)