How to get category lists by name or slug

Question

If you are looking for specific term objects from the term slugs, from a specific taxonomy, I think new WP_Term_Query() is your best bet:

$term_args = array(
  'taxonomy' => 'category',
  'name' => array( 'accessibility','wcag', 'abc' )
  'hide_empty' => false,
  'fields' => 'all',
  'count' => true,
);

$term_query = new WP_Term_Query($term_args);

foreach($term_query->terms as $term){
    echo '<pre>';
    print_r($term); // You'll see the term object here, which is what I think you are after
    echo '</pre>';
}