Crux Australis vs Southern Cross

Crux Australis and Southern Cross both are nouns.

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

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

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

Other synonyms of Crux Australis include Crux.

Crux Australis (noun)	Southern Cross (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