You can use same controller action as shown below:
Router::connect('/clients/unverified/:limit',
array('controller' => 'users', 'action' => 'unverified',
'client','5')
);
Router::connect('/tenants/unverified/:limit',
array('controller' => 'users', 'action' => 'unverified',
'tenants','5')
);
Router::connect('/whatever/unverified/:limit',
array('controller' => 'users', 'action' => 'unverified',
'whatever','5')
);
In users controller
# $type would be clients/ tenants/ watever
# $limit would be 5
function unverified($type='user',$limit=5){
}