constellation vs Argo Navis

constellation and Argo Navis both are nouns.

Word	Noun	Adjective	Verb	Adverb
constellation	Yes	No	No	No
Argo Navis	Yes	No	No	No

constellation (noun)	Argo Navis (noun)
an arrangement of parts or elements	formerly a large constellation in the Southern Hemisphere between Canis Major and the Southern Cross; now divided into Carina and Pyxis and Puppis and Vela
a configuration of stars as seen from the earth