It seems not possible to write :

register_taxonomy('category',array('events'), array(
        'hierarchical'                  => true,
        'labels'                        => $labels_category_events,
        'show_ui'                       => true,
        'show_in_rest'                  => true,
        'show_admin_column'             => true,
        'query_var'                     => true,
        'rewrite'                       => array( 'slug' => "evenements/category" ),
        'has_archive'                   => true,

without having conflict with "real" categories ? Thank to confirm ... or not .


2 Answers 2


As said, you can't and here's the list of reserved terms: https://codex.wordpress.org/Reserved_Terms


No, as WordPress by default register a taxonomy called category (which is linked with blog posts). However, you can assign this taxonomy(category) to your custom post type too.
using the following code snippet.

add_action( 'init', 'pixel_add_category_cpt' );
function pixel_add_category_cpt() {
    register_taxonomy_for_object_type( 'events', 'course' );


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