Gender and class grouping systems categorize nouns in languages. Some languages have natural gender systems like English that group nouns as masculine, feminine or neutral. Dyirbal, an Australian Aboriginal language, has a more complex 4 class noun system. The class a noun belongs to determines the pronoun used to refer to it. The traditional Dyirbal system grouped inanimate items, edible plants, dangerous things, and women separately from males and animals. Younger speakers now use a simplified 2 class system of natural gender.