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/* Change Billing-Shipping Label */
add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields' );
function custom_override_checkout_fields( $fields ) {
     $fields['billing']['billing_address_2']['label'] = 'Address 2';
     $fields['shipping']['shipping_address_2']['label'] = 'Address 2';
     $fields['billing']['billing_country']['label'] = '';
     unset($fields['billing']['billing_company']);
     unset($fields['shipping']['shipping_company']);
     return $fields;
}