Porter vs O. Henry

Porter and O. Henry both are nouns.

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

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

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

Other synonyms of Porter include William Sydney Porter.

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)
United States composer and lyricist of musical comedies (1891-1946)
United States writer of novels and short stories (1890-1980)