You can create a custom 404 error page and then embed code to redirect to another page . We have an article that you can use called creating a custom 404 error page. The 404 error is a standard error message but you can direct a customer to a page by adding the code in your .htaccess file like this:
ErrorDocument 404 index.html
This will show the index page when the 404 error shows. For more information on editing your .htaccess file check out Setting a 404 error page via .htaccess.
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