Registering a custom taxonomy

taxonomy.php

<?php
/**
 * Custom Taxonomy functionality
 *
 * @package     KnowTheCode\TeamBios\Custom
 * @since       1.0.0
 * @author      hellofromTonya
 * @link        https://knowthecode.io
 * @license     GNU General Public License 2.0+
 */
namespace KnowTheCode\TeamBios\Custom;

add_action( 'init', __NAMESPACE__ . '\register_custom_taxonomy' );
/**
 * Register the taxonomy.
 *
 * @since 1.0.0
 *
 * @return void
 */
function register_custom_taxonomy() {

	$args = array(
		'label'        => __( 'Departments', 'teambios' ),
		'hierarchical' => true,
	);

	register_taxonomy( 'department', 'team-bios', $args );
}