Best Difference between Navigation Testing and Usability Testing

People are aware regarding Usability Testing, but they do not know about Navigation Testing. So here I am writing the Difference between Navigation Testing and Usability Testing both so that those who have confusion in their mind regarding the Navigation and Usability Testing can simply increase their knowledge by seen the difference on both these confusing terms.

Navigation Testing	Usability Testing
1. Navigation Testing is done to ensure that external and internal links are working properly.	1. Usability Testing is always done to ensure/verify that the GUI is well designed and easily used.
2. Navigation Testing is more users friendly and it provides ability to navigate from current page and it provides ability to navigate from current page to other pages directly.	2. Usability Testing is always done to verify how much the application is user friendly to an end user.
3. In Navigation Testing, tester use the visual hierarchies like color, position etc.	3. In Usability Testing tester always test whether the control flow of the application is convenient for end user or not.
4. Navigation allows user to control the interaction sequence of pages in the application.	4. In Usability Testing tester always test whether the interaction of functionality with the user is effective in nature or not.