stuff.php

$categories = get_categories( array(
	    'orderby' => 'name',
	    'parent'  => 0,
	    'post_type' => 'orange_cats'
	) );

	echo 'Shows all taxonomies for the given post type:';
	echo '<br />';

	foreach ( $categories as $category ) {
	    printf( '<a href="%1$s">%2$s</a><br />',
	        esc_url( get_category_link( $category->term_id ) ),
	        esc_html( $category->name )
	    );

	    // Here's the child categories
	    $term_id = $category->term_id;
		$termchildren = get_term_children( $term_id, $category );

		echo '<ul>';
		foreach ( $termchildren as $child ) {
			$term = get_term_by( 'id', $child, $category );
			echo '<li>';
			echo '<button class="directory--options industries">';
			echo '<h5 class="class="loud heading__tiniest bold blue"><a href="' . get_term_link( $child, $category ) . '">' . $term->name . '</a></h5>';
			echo '</li>';
		}
		echo '</ul>';
	}