Add words to spell check SharePoint 2010

1. Create a text file on your local machine and add each custom term on a seperate line, save the file as "Custom Dictionary.txt" 2. Create a library within the root of the site collection, call it "Spelling"; upload your "Custom Dictionary.txt" file to the library For more details refer to below blog http://www.rightpoint.com/community/blogs/viewpoint/archive/2011/10/28/how-to-add-words-the-spell-check-dictionary-in-sharepoint-2010.aspx