Down vs John Langdon Down

Down and John Langdon Down both are nouns.

Word	Noun	Adjective	Verb	Adverb
Down	Yes	No	No	No
John Langdon Down	Yes	No	No	No

As nouns, Down and John Langdon Down are synonyms defined as:

Down and John Langdon Down: English physician who first described Down's syndrome (1828-1896)

Other synonyms of Down include John L. H. Down.

Down (noun)	John Langdon Down (noun)
English physician who first described Down's syndrome (1828-1896)	English physician who first described Down's syndrome (1828-1896)