Gerbert vs Pope Sylvester II

Gerbert and Pope Sylvester II both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gerbert	Yes	No	No	No
Pope Sylvester II	Yes	No	No	No

As nouns, Gerbert and Pope Sylvester II are synonyms defined as:

Gerbert and Pope Sylvester II: French pope from 999 to 1003 who was noted for his great learning (945-1003)

Other synonyms of Gerbert include Sylvester II.

Gerbert (noun)	Pope Sylvester II (noun)
French pope from 999 to 1003 who was noted for his great learning (945-1003)	French pope from 999 to 1003 who was noted for his great learning (945-1003)