constellate vs cluster

constellate is not a noun while cluster is a noun.

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

As verbs, constellate and cluster are synonyms defined as:

Other synonyms of constellate include clump, flock.

constellate (noun)	cluster (noun)
	a grouping of a number of similar things

constellate (verb)	cluster (verb)
form a constellation or cluster	gather or cause to gather into a cluster
come together as in a cluster or flock	come together as in a cluster or flock
scatter or intersperse like dots or studs