You can define taxonomy with post type.
Create and display separate categories and tags with taxonomy.
Example code:
add_action( 'init', 'artists' );
function artists() {
register_post_type( 'artists',
array(
'labels' => array(
'name' => __( 'artists' ),
'singular_name' => __( 'artist' )
),
'public' => true,
'has_archive' => true,
'rewrite' => array( 'slug' => 'artists' ),
'menu_icon' => 'dashicons-slides',
'supports' => array('title','thumbnail','editor', 'comments'),
// 'taxonomies' => array('category'),
'exclude_from_search' => false,
)
);
register_taxonomy(
'artists_cat',
'artists',
array(
'label' => __( 'category' ),
'public' => true,
'rewrite' => true,
'hierarchical' => false,
'capabilities' => array( 'edit_terms' => 'manage_categories' )
)
);
register_taxonomy_for_object_type( 'artists_cat', 'artists' );
}