cyanosis vs symptom

cyanosis and symptom both are nouns.

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

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

cyanosis: a bluish discoloration of the skin and mucous membranes
symptom: (medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease

cyanosis (noun)	symptom (noun)
a bluish discoloration of the skin and mucous membranes	anything that accompanies X and is regarded as an indication of X's existence
	(medicine) any sensation or change in bodily function that is experienced by a patient and is associated with a particular disease