Rename product tabs

Paste the following code in your theme’s functions.php:

add_filter( 'woocommerce_product_tabs', 'woo_rename_tabs', 98 );
function woo_rename_tabs( $tabs ) {

  $tabs['description']['title'] = __( 'More Information' );		// Rename the description tab
  $tabs['reviews']['title'] = __( 'Ratings' );				// Rename the reviews tab
  $tabs['additional_information']['title'] = __( 'Product Data' );	// Rename the additional information tab

  return $tabs;

}

Source: https://docs.woocommerce.com/document/editing-product-data-tabs/