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See word completions in TextEdit on Mac
You can see possible completions for a word you partially entered.
For example, for a partial word such as “ret”, you see options such as “retire” or “retrieve”. For a complete word, such as “return”, you see fewer options, such as “returning” and “returned”.
In the TextEdit app on your Mac, place the insertion point at the end of a partial word.
Choose Edit > Complete (or press Option-Esc), then select a word from the list (or use the Touch Bar).