single.phpに記事に紐づくターム名を表示する

<?php
$terms = get_the_terms($post->ID, 'カスタムタクソノミー名');
if ( !empty($terms) ) {
    foreach ( $terms as $term ) {
        echo '<span>' . $term->name . '</span>';
    }
}

<?php
$terms = get_the_terms($post->ID, 'カスタムタクソノミー名');
if ( !empty($terms) ) {
    foreach ( $terms as $term ) {
        $term_link = get_term_link($term);
        if ( !is_wp_error($term_link) ) {
            echo '<a href="' . esc_url($term_link) . '"><span>' . esc_html($term->name) . '</span></a>';
        }
    }
}
?>