I am trying to add a particular word to my custom dictionary using Word 2007. (The word happens to be "deserialized".) When I right-click on the word and click Add to Dictionary, the red underline does not go away. When I use the Spelling & Grammar tool from the Review tab on the ribbon, it will stop on that word; clicking the Add to Dictionary button has no effect.
Oddly, I am able to add other words to the custom dictionary without a problem. I recently added "deserializes", for instance. I have only encountered this problem with that one particular word.
Does anyone know what might be wrong and how I might fix it?
Clarifications
My document and all its content is set to English (United States). My custom dictionary is set to apply to All Languages, which is the default value.
"Serialize" is in the US English default dictionary, but "deserialize" and its various forms is not.
Best Answer
In Word 2010 at least,
File / Options / Proofing / Custom Dictionariesdisplays the path to the custom dictionary file being used. Generally it is%AppData%\Microsoft\UProof\Custom.dic(should be the same in Word 2007 as well), so try opening that file in Notepad (after closing Word) and check if the word has actually been added to it. If not, add it yourself on a new line, save and close, open Word, then check if it recognises the word.