The largest group into which an organism can be classified?

According to taxonomic hierarchies (taxa), the major classification group is called "superkingdom", followed by "kingdom", "suprakingdom" and "domains". Superkingdom is a taxa with only use for a better classification, not a natural classification, it makes it easier to group organisms.

The largets group is superkingdom Prokarya, the one concerned with bacterias, followed by kingdom fungi.