First Duke of Marlborough vs John Churchill

First Duke of Marlborough and John Churchill both are nouns.

Word	Noun	Adjective	Verb	Adverb
First Duke of Marlborough	Yes	No	No	No
John Churchill	Yes	No	No	No

As nouns, First Duke of Marlborough and John Churchill are synonyms defined as:

First Duke of Marlborough and John Churchill: English general considered one of the greatest generals in history (1650-1722)

Other synonyms of First Duke of Marlborough include Churchill, Duke of Marlborough.

First Duke of Marlborough (noun)	John Churchill (noun)
English general considered one of the greatest generals in history (1650-1722)	English general considered one of the greatest generals in history (1650-1722)