Dionysius vs Dionysius the Elder

Dionysius and Dionysius the Elder both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dionysius	Yes	No	No	No
Dionysius the Elder	Yes	No	No	No

As nouns, Dionysius and Dionysius the Elder are synonyms defined as:

Dionysius and Dionysius the Elder: the tyrant of Syracuse who fought the Carthaginians (430-367 BC)

Other synonyms of Dionysius include Dionysius I of Syracuse.

Dionysius (noun)	Dionysius the Elder (noun)
the tyrant of Syracuse who fought the Carthaginians (430-367 BC)	the tyrant of Syracuse who fought the Carthaginians (430-367 BC)