In Word for the web, you can click on comments to delete them while you read or edit a document. The first step depends on whether you’re in Reading View or Editing View. Documents open in Reading View.
In Reading View
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Click a comment balloon to see the comment and open the Comments pane.
Comment balloons are near the edge of the page. If you don’t see any, click Comments.
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In the Comments pane, click the comment you want to delete.
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Click the Delete icon below it.
In Editing View
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If you’re already editing the document (Edit Document > Edit in Word Web App), click Review > Show Comments.
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In the Comments pane, click the comment you want to reply to.
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Click the Delete icon below it.
For more info about reviewing documents in Word Web App, see Insert comments in a document.