Reye's syndrome vs syndrome

Reye's syndrome and syndrome both are nouns.

Word	Noun	Adjective	Verb	Adverb
Reye's syndrome	Yes	No	No	No
syndrome	Yes	No	No	No

As nouns, syndrome is a hypernym of Reye's syndrome; that is, syndrome is a word with a broader meaning than Reye's syndrome:

Reye's syndrome: acquired encephalopathy following acute viral infections (especially influenza or chicken pox) in young children; characterized by fever, vomiting, disorientation, coma, and fatty infiltration of the liver
syndrome: a pattern of symptoms indicative of some disease

Other hypernyms of Reye's syndrome include brain disease, brain disorder, encephalopathy.

Reye's syndrome (noun)	syndrome (noun)
acquired encephalopathy following acute viral infections (especially influenza or chicken pox) in young children; characterized by fever, vomiting, disorientation, coma, and fatty infiltration of the liver	a complex of concurrent things
	a pattern of symptoms indicative of some disease