Americus Vespucius vs Vespucci

Americus Vespucius and Vespucci both are nouns.

Word	Noun	Adjective	Verb	Adverb
Americus Vespucius	Yes	No	No	No
Vespucci	Yes	No	No	No

As nouns, Americus Vespucius and Vespucci are synonyms defined as:

Americus Vespucius and Vespucci: Florentine navigator who explored the coast of South America; America was named in his honor (1454-1512)

Other synonyms of Americus Vespucius include Amerigo Vespucci.

Americus Vespucius (noun)	Vespucci (noun)
Florentine navigator who explored the coast of South America; America was named in his honor (1454-1512)	Florentine navigator who explored the coast of South America; America was named in his honor (1454-1512)