Subcluster

noun
1.
a number of things of the same kind, growing or held together; a bunch:
a cluster of grapes.
2.
a group of things or persons close together:
There was a cluster of tourists at the gate.
3.
U.S. Army. a small metal design placed on a ribbon representing an awarded medal to indicate that the same medal has been awarded again:
oak-leaf cluster.
4.
Phonetics. a succession of two or more contiguous consonants in an utterance, as the str- cluster of strap.
5.
Astronomy. a group of neighboring stars, held together by mutual gravitation, that have essentially the same age and composition and thus supposedly a common origin.
Compare globular cluster, open cluster, stellar association.
verb (used with object)
6.
to gather into a cluster or clusters.
7.
to furnish or cover with clusters.
verb (used without object)
8.
to form a cluster or clusters:
The people clustered around to watch.
noun
1.
a number of things growing, fastened, or occurring close together
2.
a number of persons or things grouped together
3.
(US, military) a metal insignia worn on a medal ribbon to indicate a second award or a higher class of a decoration or order
4.
(military)

a group of bombs dropped in one stick, esp fragmentation and incendiary bombs
the basic unit of mines used in laying a minefield

5.
(astronomy) an aggregation of stars or galaxies moving together through space
6.
a group of two or more consecutive vowels or consonants
7.
(statistics) a naturally occurring subgroup of a population used in stratified sampling
8.
(chem)

a chemical compound or molecule containing groups of metal atoms joined by metal-to-metal bonds
the group of linked metal atoms present

verb
9.
to gather or be gathered in clusters