By default, Word includes its own dictionary and lets you create your own custom dictionaries. When you are creating a document, any words that are not in the dictionary are underlined with a red squiggly line. This can become an annoyance if you are repeatedly using that word throughout your document. The workaround is to add that word to the dictionary.
However, once you add a word to a dictionary, you can also delete it at any time using the steps listed below.
To delete a word from a dictionary in Word 2007:
• Click the Microsoft Office Button and click Word Options.
• Click Proofing.
• Click Custom Dictionaries.
• Select the dictionary list you want to modify and click Edit Word List.
• Select the appropriate word in the Dictionary box and click Delete.
• Repeat this step for each additional word you want to remove from the dictionary.