Word 2010 not catching misspelled word

In Word 2010, in the attached document, the word "position" is spelled "Positon" and the spell checker fails to flag it. Why is it not flagging this misspelled word? I did the spellcheck reset, the word is not added to any of the dictionaries, and my Language checker is set to US English.

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'Positon' is a genuine word, It means the same as 'positron'.
contrainAuthor Commented:
I didn't realize this was an actual word, but the Expert let me know that it is so the spellchecker is working as it should. This is what I needed to know. Thanks.
It is possible to force Word to flag words in the main dictionary as misspelt by adding them to the text file ExcludeDictionaryXXnnnn,lex in the folder
C:\Users\User Name\AppData\Roaming\Microsoft\Uproof

where XXnnnn is the language identifier
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