Here's why:
* Word uses multiple dictionaries: Word doesn't rely on a single dictionary. It uses various dictionaries based on language, context, and even user-defined custom dictionaries.
* The dictionaries are internal: These dictionaries are internal to the Word application and are not accessible or named directly by users.
However, you can refer to them as:
* Word's internal dictionaries
* Default dictionaries used by Word for spelling checks
* Spelling dictionaries
When you perform a spelling check, Word compares the words in your document against these dictionaries. If a word is not found in the dictionary, Word flags it as a potential misspelling.