The Nias language that records the cultural richness of Nias is afoness. Ke-afo-an is a mixture of five entities originating from nature or the environment, which are often used as snacks or cigarettes by residents living in the Nias archipelago's geographical area. This research aim isa to know the dominance of the ke-afo-an ecolexicon category. This study was designed with a mixed methods research approach (qualitative and quantitative). Based on the results and discussion above, there are three syntactic categories in the afo-an ecolexicon, and the most dominant category is the noun category, with a lexicon of 42 or 61%. Furthermore, based on environment, the noun lexicon that dominates is the biotic noun lexicon with 26 lexicons or 62% (flora = 23 or 55% and fauna = 3 or 7%). Finally, based on grammatical form, ecolexicon in the form of derivatives dominates with 46 or 67% of lexicons.