subcategory
Concise Oxford English Dictionary © 2008 Oxford University Press:
subcategory/ˈsʌbkatɪɡ(ə)ri/
▶noun (pl. subcategories) a secondary or subordinate category.
– derivatives
subcategorization (or subcategorisation) noun,
subcategorize (or subcategorise) verb.
subcategorization (or subcategorisation) noun,
subcategorize (or subcategorise) verb.
'subcategory' also found in these Oxford entries:

