With the advent of word processing software, there is no excuse for spelling mistakes in edited prose. All word processing programs have spelling tests that can be turned on or off. When enabled, they essentially work like this: you compare the words you enter with words in a repository of acceptable words, a dictionary, and then warn in some way that a word that is not in the dictionary may be misspelled. Most spelling tests also highlight repeated words. Many spelling checks can also be set to automatically correct some common typographical errors, for example. B for them. Words such as personal names or colloquial expressions, which would not normally be found in a book-style dictionary, are not included in the program`s dictionary. If the software tells you that a word you would expect in a dictionary is not in the dictionary, use a book-style dictionary to learn how to write a word correctly….