The word completion feature can be helpful when you start typing a word and can’t remember the exact spelling.

To use the word completion feature, start typing a word and press the Escape (ESC) key on your keyboard. This will open up a list of suggestions for the currently selected word in your document.
Word completion suggestions list.

You can then choose an option from the list and Mac OS X will complete the word for you. This feature works in TextEdit and any of the iWork programs (Keynote, Numbers and Pages).

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