Hey you! Yes, you! Thank you for adding beauty to the world!
Definitions of subcategorization:
noun: Placing something into a subcategory.
noun: (grammar) The practice of specifying what types of complements a word may take when that word acts as the head of a phrase of a certain category; this specification restricts the wordʼs category, making it smaller, hence a “subcategory” of the wordʼs category.