exordium = the beginning or introduction, especially of a discourse or treatise
peroration = the conclusion of a speech, usually intended to inspire enthusiasm
anacoluthon = a sentence with an unexpected grammatical sequence, for example "while in the kitchen, the phone rang."
catachresis = incorrect use of a word, for example, the use of mitigate for meditate
enthymeme = an argument in which a premise is not stated
metabole = a change or mutation