livedo vs skin disease

livedo and skin disease both are nouns.

Word	Noun	Adjective	Verb	Adverb
livedo	Yes	No	No	No
skin disease	Yes	No	No	No

As nouns, skin disease is a hypernym of livedo; that is, skin disease is a word with a broader meaning than livedo:

livedo: skin disorder characterized by patchy bluish discolorations on the skin
skin disease: a disease affecting the skin

Other hypernyms of livedo include disease of the skin, skin disorder.

livedo (noun)	skin disease (noun)
skin disorder characterized by patchy bluish discolorations on the skin	a disease affecting the skin