Venugopal

This plugin restricted the seleted menu so anonymous user won’t access this menu item links directly
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Menu Restrict for Anonymous users

This plugin restricted the seleted menu so anonymous user won't access this menu item links directly

confuzzledduck

Text Obfuscator is a simple plugin for replacing words and phrases in post or page content and comments with alternative words and phrases. Initially designed to remove names from personal blog posts, it can be used to correct common spelling errors or automatically expand abbreviations.
Each string can be configured to replace text on input saving the modified text to the database, or on output preserving the content in the database as it was entered by the user.
More information and support is available at <a href="http://www.flutt.co.uk/development/wordpress-plugins/text-obfuscator/" rel="nofollow ugc">Flutt.co.uk</a>.

Text Obfuscator

Really handy

Replaces words and phrases in your posts' content with alternative words and phrases.

Menu Restrict for Anonymous users vs Text Obfuscator