A: A dictionary for that document only.
A: Add some specific word, like company name or technical term, to the dictionary would help Spelling to highlight only real mistake.
A: I'm not sure, I'm new here.
Steps to Reproduce:
1. Type something that not in the current dictionary.
2. Expect the red-underlined indicating that it is not in the dictionary.
3. Right click on the red-underlined word.
Show the "Add to dictionary" option. If choose this, the selected word will not be red-underlined in this document and in another document.
Show the "Add to global dictionary" and the "Add to this document dictionary" option. If choose "Add to global dictionary" then the selected word will not be red-underlined in this document and in another document. If choose "Add to this document dictionary" then the selected word will not be red-underlined in this document but will be red-underlined in another document as usuall.
User Profile Reset: No
Version: 18.104.22.168 (x64)
Build ID: 7bcb35dc3024a62dea0caee87020152d1ee96e71
CPU threads: 4; OS: Windows 10.0; UI render: default; VCL: win;
Locale: en-US (en_US); UI-Language: en-US
You can create a new dictionary for a docment: Tools => Spelling => Options => New. You can add a word to that dictionary when you put cursor in the word and open context menu.
What remains is to associate that dictionry with a document. That's bug 90007.
*** This bug has been marked as a duplicate of bug 90007 ***