I would suggest to switch from using the lists with items enumerated within round brackets to using tables where, e.g., one has the left column containing the keyword and the top row containing the item names. The table elements are then V for the matches. Also, in thos table one is to make clear that what are items and what are keywords. When reading the text as it is now, it requires some extrra time to understand what you mean.

Existing Wording:

Keywords common to several types of items include:
…
Specialized keywords, used only with one type of item include:
…