Showed English- and Japanese-speaking 3-year-olds novel objects named with either known nouns referring to items similar in shape or material and color, or novel nouns. Found that with known nouns, children attended to shape when names referred to a shape-organized category, but not when names referred to a category organized by other properties. Children generalized novel names by shape. Examined findings within the debate between shape-based and taxonomic categories. (Author/KB)