Crux Australis vs constellation

Crux Australis and constellation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Crux Australis	Yes	No	No	No
constellation	Yes	No	No	No

Crux Australis (noun)	constellation (noun)
a small conspicuous constellation in the Southern Hemisphere in the Milky Way near Centaurus	an arrangement of parts or elements
	a configuration of stars as seen from the earth