register_taxonomy(
    "Category",
    array(
        "links"
    ),
    array(
        "hierarchical" => true,
        "label" => "Category",
        "singular_label" => "Category",
        "rewrite" => true
    )
);

register_taxonomy(
    "Tags",
    array(
        "links"
    ),
    array(
        "hirearchical" => true,
        "label" => "Tags",
        "singular_label" => "Tag",
        "rewrite" => true
    )
);