First Duke of Marlborough vs Duke of Marlborough

First Duke of Marlborough and Duke of Marlborough both are nouns.

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

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

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

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

First Duke of Marlborough (noun)	Duke of Marlborough (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)