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Select the File menu and select Options.
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Select the Proofing tab, clear the Check spelling as you type box, and select OK.
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On the Word menu, select Preferences.
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Select
  Edit, clear the Check spelling as you type box, and exit Preferences.
Spell check is built into your browser in Word for the web.
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To control spell checking settings, go to the Review tab and select
 Editor. -
Select Editor Settings and adjust the settings you want.
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Choose OK.