drought vs waterlessness

drought and waterlessness both are nouns.

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

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

drought: a shortage of rainfall
waterlessness: the condition of not containing or being covered by a liquid (especially water)

Other hypernyms of drought include dryness, xerotes.

drought (noun)	waterlessness (noun)
a shortage of rainfall	the condition of not containing or being covered by a liquid (especially water)
a prolonged shortage