Word Highlighter lets you easily highlight important words in your WordPress site. It works globally for all posts, pages and other custom post types.
The plugin allows you to use various types of text decorations for keywords like you can make them bold, italicized or underline them, gives emphasis to the words and makes them more important for the search engine spiders.
You can also use custom background and foreground color for highlighting keywords.
Start by installing and activating Word Highlighter plugin. Upon activation visit your admin area dashboard Settings -> Words Highlighter page.
Now enter the words you want to highlight in your website and select your customization options.