Old World vs Afroeurasia

Old World and Afroeurasia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Old World	Yes	No	No	No
Afroeurasia	Yes	No	No	No

As nouns, Old World and Afroeurasia are synonyms defined as:

Old World and Afroeurasia: regions of the world such as Africa, Europe and Asia that were known to Europeans before the discovery of the Americas which they called the New World

Other synonyms of Old World include Afro-Eurasia, Eurafrasia.

Old World (noun)	Afroeurasia (noun)
regions of the world such as Africa, Europe and Asia that were known to Europeans before the discovery of the Americas which they called the New World	regions of the world such as Africa, Europe and Asia that were known to Europeans before the discovery of the Americas which they called the New World