Synonyms of expatiation

1 Syllable
talk, screed, spiel
2 Syllables
sermon, descant
3 Syllables
prelection, harangue, homily, oration, lecture, discourse
4 Syllables
exhortation, allocution, recitation, epilogue, peroration, monologue, declamation, disquisition, dissertation
5 Syllables
amplifications, amplification