Change In Stock or Out of Stock text in WooCommerce

add_filter( 'woocommerce_get_availability', 'custom_get_availability', 1, 2);
  
function custom_get_availability( $availability, $_product ) {
    //change text "In Stock' to 'SPECIAL ORDER'
    if ( $_product->is_in_stock() ) $availability['availability'] = __('AVAILABLE', 'woocommerce');
  
    //change text "Out of Stock' to 'SOLD OUT'
    if ( !$_product->is_in_stock() ) $availability['availability'] = __('SOLD OUT', 'woocommerce');
        return $availability;
    }

In case of any complain or © copyright or issues please check disclaimer page for faster resolutions.