@Gil, your solution in comment seems to be excellent!
I just modified a small part to be sure not to have a PHP warning on execution.
$w_year = $_GET['w_year'];
$catid = '';
$taxonomies = get_taxonomies();
foreach ( $taxonomies as $taxonomy ) {
if ( $term_object = get_term_by( 'slug', $w_year , $taxonomy ) ) {
if ( !empty($term_object->term_id) ) {
$catid = $term_object->term_id;
break;
}
}
}
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