cluster vs huddle

cluster and huddle both are nouns.

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

As verbs, huddle is a hyponym of cluster; that is, huddle is a word with a more specific, narrower meaning than cluster:

Other hyponyms of cluster include huddle together, bunch, bunch together, bunch up.

cluster (noun)	huddle (noun)
a grouping of a number of similar things	(informal) a quick private conference
	a disorganized and densely packed crowd

cluster (verb)	huddle (verb)
gather or cause to gather into a cluster	crouch or curl up
come together as in a cluster or flock	crowd or draw together