conglomerate

nouns

a composite rock made up of particles of varying size

a group of diverse companies under common ownership and run as a single organization

conglomerate, empire

collect or gather

"Journals are accumulating in my office"; "The work keeps piling up"

accumulate, amass, conglomerate, cumulate, gather, pile up

is derived from

is derived from

composed of heterogeneous elements gathered into a mass

"the conglomerate peoples of New England"

conglomerate

is similar to

made or joined or united into one