For many people the most useful feature of using a
    word processor is the ability to locate and correct misspelled words. Microsoft Office
    provides a Spell checker that allows you to search your document for misspelled
    words. At each misspelled word it will try to guess at the intended word, and offer
    suggestions for correcting the possible mistake. Not all words it flags are actual
    misspelled words. Word uses an internal dictionary of words to identify potential
    misspellings. If a word is not in its dictionary, it is flagged as misspelled. Often new
    words in the english language, technical terms, and colloquialisms will be flagged as
    incorrect. Word provides the option of adding new words to a Custom Dictionary so
    that any time in the future the word is used in a document it won't be flagged as an
    error.  | 
  
As mentioned above Word provides support for a Custom Dictionary. You can add and delete words from the Custom Dictionary feature.
Select the Options... command from the Tools menu and click on the Spelling & Grammar tab.

Click on the Dictionaries button. You will get a Custom Dictionaries dialog box.

Copyright 1996 by the Curators of the University of Missouri