barrenness vs aridity

barrenness and aridity both are nouns.

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

As nouns, barrenness and aridity are synonyms defined as:

Other synonyms of barrenness include fruitlessness.

barrenness (noun)	aridity (noun)
the quality of yielding nothing of value	the quality of yielding nothing of value
the state (usually of a woman) of having no children or being unable to have children	a deficiency of moisture (especially when resulting from a permanent absence of rainfall)