1. 
   Sub-category
   A sector within a product category (e.g. if the category is desserts, a sub-category may be chilled desserts).
   Found op http://www.igd.com/index.html?id=1&fid=5&sid=43&tid=58&cid=507
   
   
2. 
   Subcategory
   In mathematics, a subcategory of a category C is a category S whose objects are objects in C and whose morphisms are morphisms in C with the same identities and composition of morphisms. Intuitively, a subcategory of C is a category obtained from C by "removing" some of its objects and arrows. ==Fo...
   Found op http://en.wikipedia.org/wiki/Subcategory
   
   

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