The Arrangement of Words
From LSJ
Οὔτ' ἐν φθιμένοις οὔτ' ἐν ζωοῖσιν ἀριθμουμένη, χωρὶς δή τινα τῶνδ' ἔχουσα μοῖραν → Neither among the dead nor the living do I count myself, having a lot apart from these
Wikipedia EN
Περὶ συνθέσεως ὀνομάτων, The Arrangement of Words, Lat. De Compositione Verborum, a treatise by Dionysius of Halicarnassus treating of the combination of words according to the different styles of oratory.