IPA: //ˈsʌbˌkætəɡəri//
KK: /sʌbˈkætəˌɡɔri/
A smaller group that is part of a larger group, sharing specific features or characteristics.
In the library, fiction is a subcategory of literature.
Subcategory → It is formed from "sub-" (meaning under or below) and "category" (from Greek "katēgoria", meaning a class or division). The word "subcategory" refers to a class or division that is under a broader category.
Think of something that is a class or division that is 'under' another class — 'sub-' means under, and 'category' refers to a class.