"clusters" in the noun sense
1. bunch, clump, cluster, clustering
a grouping of a number of similar things
"a bunch of trees"
"a cluster of admirers"
"clusters" in the verb sense
1. cluster, constellate, flock, clump
come together as in a cluster or flock
"The poets constellate in this town every summer"
2. bunch, bundle, cluster, clump
gather or cause to gather into a cluster
"She bunched her fingers into a fist"
Source: WordNet® (An amazing lexical database of English)
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