[Wordpress] Deny user add/edit perms on Taxonomies

wp-prevent-terms.php

<?php
// Deny user add/edit perms on Taxonomies
function prevent_terms($term, $taxonomy)
{
    if('taxonomy_slug' === $taxonomy && current_user_can('role_slug')) 
    {
      return new WP_Error('term_addition_blocked', __('You cannot add terms to this taxonomy'));
    }
    return $term;
}
add_action('pre_insert_term', 'prevent_terms', 1, 2);