Duke of Wellington vs Arthur Wellesley

Duke of Wellington and Arthur Wellesley both are nouns.

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

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

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

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

Duke of Wellington (noun)	Arthur Wellesley (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)