Ao revisar documentos, execute Recheck Document
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Check spelling and grammar in Office 2010 and later - Office Support
Recheck spelling and grammar that you previously ignored
In Word ..., you can force a recheck of the words and grammar that you previously skipped by doing the following:
Open the document or item that you want to check.
On the File menu, click Options, and then:
In Word: Click Proofing, and then under When correcting spelling and grammar in Word, click Recheck Document.
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Click Yes when you see the warning message about resetting the spelling and grammar checker.
Click OK in the dialog box to get back to the document, and then run the spelling and grammar checker again.