agglomerate

nouns

volcanic rock consisting of large fragments fused together
agglomerate
is a type of (narrower)
extrusive igneous rock solidified near or on the surface of the Earth
volcanic rock
a collection of objects laid on top of each other
agglomerate, cumulation, cumulus, heap, mound, pile

verbs

form into one cluster
agglomerate
is derived from
agglomerative
is derived from
agglomerator
is a type of (narrower)
gather or cause to gather into a cluster
"She bunched her fingers into a fist"
bunch, bunch up, bundle, clump, cluster

adjectives

clustered together but not coherent
"an agglomerated flower head"
agglomerate, agglomerated, agglomerative, clustered