xeroma vs waterlessness

xeroma and waterlessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
xeroma	Yes	No	No	No
waterlessness	Yes	No	No	No

As nouns, waterlessness is a hypernym of xeroma; that is, waterlessness is a word with a broader meaning than xeroma:

xeroma: abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A
waterlessness: the condition of not containing or being covered by a liquid (especially water)

Other hypernyms of xeroma include dryness, xerotes.

xeroma (noun)	waterlessness (noun)
abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A	the condition of not containing or being covered by a liquid (especially water)