The inventory of reciprocal, plurative, and cooperative.
2.
Diedrich Hermann Westermann, a missionary and linguist, hesitated between assigning it to singulative plurative morphology typical of Nilo-Saharan languages, though it is difficult to show that any of the branches of Nilo-Saharan are actually related.
3.
Dimmendaal ( 2000 ), who tentatively included Koman within Nilo-Saharan, excluded Gumuz as an isolate, as it did not share the tripartite singulative collective plurative number system characteristic of the rest of the Nilo-Saharan language families.