Diaz vs Dias

Diaz and Dias both are nouns.

Word	Noun	Adjective	Verb	Adverb
Diaz	Yes	No	No	No
Dias	Yes	No	No	No

As nouns, Diaz and Dias are synonyms defined as:

Diaz and Dias: Portuguese explorer who in 1488 was the first European to get round the Cape of Good Hope (thus establishing a sea route from the Atlantic to Asia) (1450-1500)

Other synonyms of Diaz include Bartholomeu Dias, Bartholomeu Diaz, Bartolomeu Dias.

Diaz (noun)	Dias (noun)
Portuguese explorer who in 1488 was the first European to get round the Cape of Good Hope (thus establishing a sea route from the Atlantic to Asia) (1450-1500)	Portuguese explorer who in 1488 was the first European to get round the Cape of Good Hope (thus establishing a sea route from the Atlantic to Asia) (1450-1500)