Argo vs Argo Navis

Argo and Argo Navis both are nouns.

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

As nouns, Argo and Argo Navis are synonyms defined as:

Argo and Argo Navis: 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

Argo (noun)	Argo Navis (noun)
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	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