Return 410 Gone for Removed Pages
Answers requests for pages you deleted on purpose with a "410 Gone" status instead of a 404, so search engines drop them from results faster.
Snippet Library
Redirects snippets for WordPress
Snippets that send visitors where they should go: redirect after login or logout, from attachment pages, old URLs and empty searches, or to a maintenance page. Quick fixes when you only need a few redirects, not a redirection plugin.
Turn 404 Errors Into Search Results
Sends visitors who hit a missing page to a site search for the words in the broken address, so they land on likely matches instead of a dead end.