xanthosis vs skin disorder

xanthosis and skin disorder both are nouns.

Word	Noun	Adjective	Verb	Adverb
xanthosis	Yes	No	No	No
skin disorder	Yes	No	No	No

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

Other hypernyms of xanthosis include disease of the skin, skin disease.

xanthosis (noun)	skin disorder (noun)
an abnormal yellow discoloration of the skin	a disease affecting the skin