John Langdon Down vs John L. H. Down

John Langdon Down and John L. H. Down both are nouns.

Word	Noun	Adjective	Verb	Adverb
John Langdon Down	Yes	No	No	No
John L. H. Down	Yes	No	No	No

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

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

Other synonyms of John Langdon Down include Down.

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