Das Routenmuster kann nicht mehr als einmal den variablen Namen referenzieren. Laravel

When you define a route as a resource then Laravel seems to create all the
  routes necessary for your resource: GET, POST, PATCH, DELETE.

So you would just need to define 
Route::resource('taxonomy','TaxonomyController'); 
or 
Route::resource('taxonomy.post','TaxonomyPostController');
Lokesh003Coding