Henri Rousseau vs Le Douanier Rousseau

Henri Rousseau and Le Douanier Rousseau both are nouns.

Word	Noun	Adjective	Verb	Adverb
Henri Rousseau	Yes	No	No	No
Le Douanier Rousseau	Yes	No	No	No

As nouns, Henri Rousseau and Le Douanier Rousseau are synonyms defined as:

Henri Rousseau and Le Douanier Rousseau: French primitive painter (1844-1910)

Other synonyms of Henri Rousseau include Rousseau.

Henri Rousseau (noun)	Le Douanier Rousseau (noun)
French primitive painter (1844-1910)	French primitive painter (1844-1910)