cluster

nouns

a grouping of a number of similar things
"a bunch of trees"; "a cluster of admirers"
bunch, clump, cluster, clustering

verbs

come together as in a cluster or flock
"The poets constellate in this town every summer"
clump, cluster, constellate, flock
is derived from
clustering
gather or cause to gather into a cluster
"She bunched her fingers into a fist"
bunch, bunch up, bundle, clump, cluster
is derived from
clustering