plan vs constellation

plan and constellation both are nouns.

Word	Noun	Adjective	Verb	Adverb
plan	Yes	No	Yes	No
constellation	Yes	No	No	No

As nouns, constellation is a hyponym of plan; that is, constellation is a word with a more specific, narrower meaning than plan:

Other hyponyms of plan include configuration, layout, snare, trap, hotel plan, meal plan.

plan (noun)	constellation (noun)
scale drawing of a structure	an arrangement of parts or elements
a series of steps to be carried out or goals to be accomplished	a configuration of stars as seen from the earth
an arrangement scheme

plan (verb)	constellation (verb)
make plans for something
have the will and intention to carry out some action
make or work out a plan for; devise