headwear

This term serves as a collective noun encompassing all types of items worn on the head. It is primarily used in formal, commercial, or technical contexts, such as in retail categories, museum catalogs, or dress code regulations, rather than in casual conversation where specific names like hat or cap are preferred.

Grammatically, this word is uncountable. It describes a category of clothing rather than individual items. To refer to a single object, one must use a partitive construction such as a piece of headwear or a specific noun like a helmet.