William Sydney Porter vs O. Henry

William Sydney Porter and O. Henry both are nouns.

Word	Noun	Adjective	Verb	Adverb
William Sydney Porter	Yes	No	No	No
O. Henry	Yes	No	No	No

As nouns, William Sydney Porter and O. Henry are synonyms defined as:

William Sydney Porter and O. Henry: United States writer of short stories whose pen name was O. Henry (1862-1910)

Other synonyms of William Sydney Porter include Porter.

William Sydney Porter (noun)	O. Henry (noun)
United States writer of short stories whose pen name was O. Henry (1862-1910)	United States writer of short stories whose pen name was O. Henry (1862-1910)