Crux Australis vs Crux

Crux Australis and Crux both are nouns.

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

As nouns, Crux Australis and Crux are synonyms defined as:

Crux Australis and Crux: a small conspicuous constellation in the Southern Hemisphere in the Milky Way near Centaurus

Other synonyms of Crux Australis include Southern Cross.

Crux Australis (noun)	Crux (noun)
a small conspicuous constellation in the Southern Hemisphere in the Milky Way near Centaurus	a small conspicuous constellation in the Southern Hemisphere in the Milky Way near Centaurus