Arthur Wellesley vs Duke of Wellington

Arthur Wellesley and Duke of Wellington both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arthur Wellesley	Yes	No	No	No
Duke of Wellington	Yes	No	No	No

As nouns, Arthur Wellesley and Duke of Wellington are synonyms defined as:

Arthur Wellesley and Duke of Wellington: British general and statesman; he defeated Napoleon at Waterloo; subsequently served as Prime Minister (1769-1852)

Other synonyms of Arthur Wellesley include First Duke of Wellington, Iron Duke, Wellington.

Arthur Wellesley (noun)	Duke of Wellington (noun)
British general and statesman; he defeated Napoleon at Waterloo; subsequently served as Prime Minister (1769-1852)	British general and statesman; he defeated Napoleon at Waterloo; subsequently served as Prime Minister (1769-1852)