unproductiveness vs aridity

unproductiveness and aridity both are nouns.

Word	Noun	Adjective	Verb	Adverb
unproductiveness	Yes	No	No	No
aridity	Yes	No	No	No

As nouns, aridity is a hypernym of unproductiveness; that is, aridity is a word with a broader meaning than unproductiveness:

Other hypernyms of unproductiveness include barrenness, fruitlessness.

unproductiveness (noun)	aridity (noun)
the quality of lacking the power to produce	the quality of yielding nothing of value
	a deficiency of moisture (especially when resulting from a permanent absence of rainfall)