Source

File: wp-includes/comment.php

function get_comment_statuses() {
	$status = array(
		'hold'    => __( 'Unapproved' ),
		'approve' => _x( 'Approved', 'comment status' ),
		'spam'    => _x( 'Spam', 'comment status' ),
		'trash'   => _x( 'Trash', 'comment status' ),
	);

	return $status;
}