Antony vs Antonius

Antony and Antonius both are nouns.

Word	Noun	Adjective	Verb	Adverb
Antony	Yes	No	No	No
Antonius	Yes	No	No	No

As nouns, Antony and Antonius are synonyms defined as:

Antony and Antonius: Roman general under Julius Caesar in the Gallic wars; repudiated his wife for the Egyptian queen Cleopatra; they were defeated by Octavian at Actium (83-30 BC)

Other synonyms of Antony include Anthony, Marcus Antonius, Mark Anthony, Mark Antony.

Antony (noun)	Antonius (noun)
Roman general under Julius Caesar in the Gallic wars; repudiated his wife for the Egyptian queen Cleopatra; they were defeated by Octavian at Actium (83-30 BC)	Roman general under Julius Caesar in the Gallic wars; repudiated his wife for the Egyptian queen Cleopatra; they were defeated by Octavian at Actium (83-30 BC)