<form method="get" action="<?php echo home_url(); ?>">
<h3>タイトル1</h3>
<?php $terms = get_terms( '<!--タクソノミー1 -->' ); ?>
<?php if( $terms ): ?>
    <ul class="terms">
        <?php foreach( $terms as $term ): ?>
        <li>
            <input type="radio<!--ラジオボタンの指示がここ -->" name="<!--タクソノミー1 -->" value="<?php echo esc_attr( $term->slug ); ?>">
            <?php echo esc_html( $term->name ); ?>
        </li>
        <?php endforeach; ?>
    </ul>
<?php endif; ?>
 
<h3>タイトル2</h3>
<?php $terms = get_terms( '<!--タクソノミー2 -->' ); ?>
<?php if( $terms ): ?>
    <ul class="terms">
        <?php foreach( $terms as $term ): ?>
        <li>
            <input type="radio" name="<!--タクソノミー2 -->" value="<?php echo esc_attr( $term->slug ); ?>">
            <?php echo esc_html( $term->name ); ?>
        </li>
        <?php endforeach; ?>
    </ul>
<?php endif; ?>
 

 
<input type="submit" value="検索">
</form>