記事(single.php)所属する子タームのみ表示する
<?php if ($terms = get_the_terms($post->ID, 'タクソノミー名')) { foreach ( $terms as $term ): if($term->parent) echo esc_html($term->name); endforeach; } ?>
<?php if ($terms = get_the_terms($post->ID, 'タクソノミー名')) { foreach ( $terms as $term ): if($term->parent) echo esc_html($term->name); endforeach; } ?>