Want to redirect 404 error page to your homepage in wordpress? Here is how
Login to your wordpress admin page http://website.com/wp-admin/
Go to “Apperarance” -> “Editor” -> 404.php
If your theme doesnt have 404.php page, create one under your theme directory wp-content/themes/themename/
Change or create your 404.php code to these
<?php
header("HTTP/1.1 301 Moved Permanently");
header("Location: ".get_bloginfo('url'));
exit(); ?>
What those code does is to tell browswer that page has moved permantly with 301 error code, then redirect to your home page.