Great attractor has 2 different meanings across 2 categories:
a massive grouping of galaxies in the direction of Centaurus and Hydra whose gravitational attraction is believed to cause deviations in the paths of other galaxies
An apparent gravitational anomaly in intergalactic space at the center of the local Laniakea Supercluster, in which the Milky Way is located. It suggests a localized concentration of mass thousands of times more massive than the Milky Way.