You can locate any word on your website Quality Assurance>Spelling>Word List.
The Word List details all words that have been found on the site, and for every word that has been found on the site, you have the ability to confirm it as a misspelling, and confirm what the word should be replaced with.
This is particularly useful if you are looking to rid your site of out-of-date terms.
1) Search for the unwanted word in the words list.
2) Add the correct spelling or word that should be used in the suggestions column, and click to highlight.
3) Confirm the word as a misspelling.
4) The word will now appear in the Misspellings list with the correct spelling/replacement word highlighted.