A supercluster is a cluster of galaxy groups and clusters. Typical size is several hundred million light-years, and about 1017 solar masses.
Whether a given supercluster is gravitationally bound is often a subject of repeated analysis, often concluding that particular superclusters are not. That leaves it a term for "a grouping of clusters, which may or may not be gravitationally bound", which some consider to be of little use.
The Local Supercluster or Virgo Supercluster includes the Local Group (with the Milky Way) as well as the Virgo Cluster and is thought to contain 47,000 galaxies. Laniakea Supercluster has been declared a larger supercluster that includes the Virgo Supercluster, so the term Local Supercluster might be used to mean it instead.