syndrome vs symptom

syndrome and symptom both are nouns.

Word	Noun	Adjective	Verb	Adverb
syndrome	Yes	No	No	No
symptom	Yes	No	No	No

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

syndrome: a pattern of symptoms indicative of some disease
symptom: (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease

syndrome (noun)	symptom (noun)
a complex of concurrent things	anything that accompanies X and is regarded as an indication of X's existence
a pattern of symptoms indicative of some disease	(medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease