This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of cluster.

n. The action of the verb to cluster.

n. A grouping of a number of similar things.

n. The grouping of a population based on ethnicity, economics or religion.

n. The undesirable, contiguous grouping of elements in a hash table.

n. A prewriting technique consisting of writing ideas down on a sheet of paper around a central idea within a circle, with the related ideas radially joined to the circle using rays.

n. a grouping of a number of similar things

clustered    clustering    clusters   

clusters of bruch   

clustered    clustering    star cluster    globular cluster    open cluster    cluster bomb    cluster analysis   

bunch    group    crowd    mob    clump    gather   

Buster    Custer    adjuster    bluster    buster    duster    fluster    juster    luster    lustre   

bunch    clump    row    array    mass    hundred    patch    shape    collection    group