Iron Duke vs Arthur Wellesley

Iron Duke and Arthur Wellesley both are nouns.

Word	Noun	Adjective	Verb	Adverb
Iron Duke	Yes	No	No	No
Arthur Wellesley	Yes	No	No	No

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

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

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

Iron Duke (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)