neurosyphilis vs syphilis

neurosyphilis and syphilis both are nouns.

Word	Noun	Adjective	Verb	Adverb
neurosyphilis	Yes	No	No	No
syphilis	Yes	No	No	No

As nouns, syphilis is a hypernym of neurosyphilis; that is, syphilis is a word with a broader meaning than neurosyphilis:

neurosyphilis: syphilis of the central nervous system
syphilis: a common venereal disease caused by the treponema pallidum spirochete; symptoms change through progressive stages; can be congenital (transmitted through the placenta)

Other hypernyms of neurosyphilis include lues, lues venerea, pox, syph.

neurosyphilis (noun)	syphilis (noun)
syphilis of the central nervous system	a common venereal disease caused by the treponema pallidum spirochete; symptoms change through progressive stages; can be congenital (transmitted through the placenta)