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F7 — Document Proofing
Before on-the-fly spell checking was popular, there was Spell Check Mode. That’s where you finished your document and then Word helped you plod through it, mistake by mistake, to highlight your typos and offer suggestions. The F7 key provides you a blast into that past.
Press the F7 key to enter Document Proofing mode. Word immediately takes you to the next misspelled word in your document. Use the Spelling pane to choose a replacement word, ignore the word, add the word to the dictionary, and so on.