Findwords

This Plugin searches all the posts, pages with a blog. You have to enclose the term you want to search
with shortcode like [findwordsc]Searchterm[/findwordsc]. The plugin “Searchterm” is searched throughout the blog. A rolling carousel is displayed
which contains button links to all the posts and pages, containing the word “Searchterm”.
After clicking the link, the post is displayed in a modal popup(Thickbox). In the post thus displayed by clicking on the link, all the occurrences of search
terms are highlighted. The highlighting style is controlled by settings.
The settings page is opened by clicking in the “Findwords options” menu item in the settings menu.
mark.js Javascript/ Jquery plugin is used for highlighting.
Link to the mark.js plugin:
https://markjs.io