Raynaud's sign vs cyanosis

Raynaud's sign and cyanosis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Raynaud's sign	Yes	No	No	No
cyanosis	Yes	No	No	No

As nouns, cyanosis is a hypernym of Raynaud's sign; that is, cyanosis is a word with a broader meaning than Raynaud's sign:

Raynaud's sign: cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion
cyanosis: a bluish discoloration of the skin and mucous membranes

Raynaud's sign (noun)	cyanosis (noun)
cyanosis of the extremities; can occur when a spasm of the blood vessels is caused by exposure to cold or by strong emotion	a bluish discoloration of the skin and mucous membranes