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Synonyms for Conglomerate (same or very similar meaning)

WordNet sense 1 (a composite rock made up of particles of varying size):
pudding stone

WordNet sense 2 (a group of diverse companies under common ownership and run as a single organization):
empire

WordNet sense 3 (made or joined or united into one):
combined

WordNet sense 4 (collect or gather):
accumulate, amass, gather, cumulate, pile up


From the ODE community, based on WordNetadd/edit