Conglomerate and conglomeration emphasize the heterogeneousness of the components and often suggest their assemblage from a wide variety of sources; sometimes either is applied to a heap of things, sometimes to an aggregate in which the arts are clearly distinguishable [examples omitted] Agglomerate and agglomeration in general use seldom imply coherence of parts; they suggest either a huddling together or often a fortuitous...

As nouns the difference between conglomerate and agglomerate is that conglomerate is a cluster of heterogeneous things while agglomerate is a collection or mass. As adjectives the difference between conglomerate and agglomerate is that conglomerate is clustered together into a mass while agglomerate is collected into a ball, heap, or mass.