John Marquand vs John P. Marquand

John Marquand and John P. Marquand both are nouns.

Word	Noun	Adjective	Verb	Adverb
John Marquand	Yes	No	No	No
John P. Marquand	Yes	No	No	No

As nouns, John Marquand and John P. Marquand are synonyms defined as:

John Marquand and John P. Marquand: United States writer who created the Japanese detective Mr. Moto and wrote other novels as well (1893-1960)

Other synonyms of John Marquand include John Philip Marquand, Marquand.

John Marquand (noun)	John P. Marquand (noun)
United States writer who created the Japanese detective Mr. Moto and wrote other novels as well (1893-1960)	United States writer who created the Japanese detective Mr. Moto and wrote other novels as well (1893-1960)