Synonyms of didactic

2 Syllables
inkhorn, moral, preachy, donnish, teachy, schoolish
3 Syllables
tutorial, edifying, sermonic, teacherish, teacherly, pedantic
4 Syllables
academic, enlightening, pedagogic, instructional, hortative, moralizing, instructive, homiletic, preceptive, schoolmasterist, sermonizing, didactical, overnice, advisory
5 Syllables
expository, pedagogical, exhortative, educational, disquisitional, homiletical, lecturelike
6 Syllables
illuminative