cluster vs gather

cluster and gather both are nouns.

Word	Noun	Adjective	Verb	Adverb
cluster	Yes	No	Yes	No
gather	Yes	No	Yes	No

As verbs, gather is a hypernym of cluster; that is, gather is a word with a broader meaning than cluster:

Other hypernyms of cluster include assemble, foregather, forgather, meet.

cluster (noun)	gather (noun)
a grouping of a number of similar things	the act of gathering something
	sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching

cluster (verb)	gather (verb)
gather or cause to gather into a cluster	increase in amount by collecting or gathering
come together as in a cluster or flock	increase or develop
	conclude from evidence
	assemble or get together
	draw together into folds or puckers
	look for (food) in nature
	draw and bring closer
	collect in one place
	get people together