xeroma vs dryness

xeroma and dryness both are nouns.

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

As nouns, dryness is a hypernym of xeroma; that is, dryness 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
dryness: the condition of not containing or being covered by a liquid (especially water)

Other hypernyms of xeroma include waterlessness, xerotes.

xeroma (noun)	dryness (noun)
abnormal dryness of the conjunctiva and cornea of the eyes; may be due to a systemic deficiency of vitamin A	objectivity and detachment
	moderation in or abstinence from alcohol or other drugs
	the condition of not containing or being covered by a liquid (especially water)