 A prominent approach to determining the ontological categories that are implicit in the use of natural language is via Natural Language Ontology, which provides one way of undertaking a descriptivist approach to categories. As Friederike Moltmann (2017) makes clear, however, the methodology for doing natural language ontology is importantly different from attempts to determine a common sense ontology by simply asking what ontological claims or categories people explicitly accept or would accept on reflection. So, for example, Natural Language Ontology doesn’t determine the ontological categories of a natural language by looking to explicit assertions speakers make (or would assent to) about categories, such as “objects are not events”. Instead, natural language category distinctions are revealed by uncovering the presuppositions of sentences used by ordinary speakers. For example, the fact that one can acceptably say “The building existed last year” but not “The building took place last year”, and “John’s arrival took place last week” but not “John’s arrival existed last week”, it has been argued, presupposes a difference of category between material objects and events, since the conditions of applicability for these predicates apparently presuppose that they apply to entities of different categories (Moltmann 2017, Section 3.1). Since Natural Language Ontology “concerns itself with the ontological categories and structures a speaker accepts when using a language, not those a speaker accepts when engaging in some form of philosophical reflection”, its results may differ widely from the ontological categories many philosophers would reflectively accept, and even from those commonly attributed to natural language (Moltmann 2017, Section 1). We have reason to engage in natural language ontology, Moltmann argues, since it may give us “the best indication of how we, implicitly, conceive of things” (2017, Section 7). A question that remains is whether there will be a uniform ontology found across all natural languages, perhaps one fixed by our cognitive structure.