WP Clean Up can help us to clean up the wordpress database by removing "revision" "draft" "auto draft" and so on.
WP-Sweep allows you to clean up unused, orphaned and duplicated data in your WordPress. It also optimizes your database tables.
The all in one tool for check, repair, fix and optimize your WordPress blog.
View the list of all your cron scheduled tasks, then clean what you want.
This plugin will handle the orphan words from: post/page title, widget title, widget text and comment text.