Route::namespace('AdminHotel')->prefix('hotels')->name('hotels.')->group(function () {
    Route::resource('/', 'HotelController');
    Route::resource('rooms', 'RoomController');
    Route::resource('rooms/gallery', 'RoomGalleryController');
});

Route::namespace('AdminHotel')->group(function () {
    Route::resource('hotels', 'HotelController');
});

Route::resource('hotels', 'AdminHotelHotelController');

Route::namespace('AdminHotel')->group(function () {
    Route::resource('hotels', 'HotelController');
    Route::prefix('hotels')->name('hotels.')->group(function () {
        Route::resource('gallery', 'HotelGalleryController');
        Route::resource('rooms', 'RoomController');
        Route::resource('rooms/gallery', 'RoomGalleryController');
    });
});

Route::group(['namespace' => 'AdminHotel', 'prefix' => 'hotel'], function(){
    ...
});