subordinate category
a subdivision of a basic-level category formed at a more specific level of categorization. For example, Siamese cat is a subordinate category of the basic-level category cat, and rocking chair is a subordinate category of chair. A subordinate category is usually characterized by (a) a high level of resemblance among its members and (b) a relatively low level of difference between its members and those of neighboring categories (e.g., Siamese cats tend to look quite similar to each other but do not look very different from Orientals). The name of the subordinate category often incorporates the name of the basic-level category, as in the examples given above.