Afroeurasia vs Old World

Afroeurasia and Old World both are nouns.

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

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

Afroeurasia and Old 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

Other synonyms of Afroeurasia include Afro-Eurasia, Eurafrasia.

Afroeurasia (noun)	Old World (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