In this project, I will investigate primary deverbal nominalizations formed with the suffixes *-tu-, *-ti-, *-(e/o)s-, and -men- in Ancient Greek, Indo-Iranian, and their proto-language. Specifically, I will focus on establishing root-suffix combination restrictions, creating a predictive model for the semantics of these derivatives, and exploring possible synchronic systems within their diachronic development. The empirical study will involve close reading of ancient texts, the consideration of secondary derivatives that might reflect lost primary derivatives, the distinction between nominalizations denoting events versus entities, and the interplay between these nouns and other verbal forms, such as participles or verbal adjectives. For the formulation of the semantic prediction model, I will adopt an Integral Linguistics approach. This methodology will help explain why certain verbal structural changes result in new (contextual) meanings in the derivative, while others do not. This research is groundbreaking as it fills a significant gap in our understanding of ancient word-formation processes, which is essential for accurate etymological reconstruction and semantic analysis. Additionally, I will bridge the gap between scholars working on deverbal nominalizations in modern and ancient languages, by demonstrating how insights linked to divergent approaches may be valuable for one another.