Disable a link possible?

Hi,
I want to disable a link and route. Is it possible? i.e

PHP Code:

$route['test/admin'] = 'admin'; 


myproject.com/test/admin now going to myproject.com/admin, this is ok. But still myproject.com/admin link is working.

What i have need that disable the link so that no one can access through this link myproject.com/admin

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@rejoan

PHP Code:

$route['test/admin'] = 'admin';  // go to controller admin via myproject.com/test/admin 
$route['admin'] = 'anythingYouWant';  // if myproject.com/admin it leads to myproject.com/anythingYouWant 


anythingYouWant can be a 404 page