historiographer vs Gaius Cornelius Tacitus

historiographer and Gaius Cornelius Tacitus both are nouns.

Word	Noun	Adjective	Verb	Adverb
historiographer	Yes	No	No	No
Gaius Cornelius Tacitus	Yes	No	No	No

historiographer (noun)	Gaius Cornelius Tacitus (noun)
a person who is an authority on history and who studies it and writes about it	Roman historian who wrote major works on the history of the Roman Empire (56-120)