inanity vs vacuity

inanity and vacuity both are nouns.

Word	Noun	Adjective	Verb	Adverb
inanity	Yes	No	No	No
vacuity	Yes	No	No	No

As nouns, inanity and vacuity are synonyms defined as:

Other synonyms of inanity include mindlessness, pointlessness, senselessness.

inanity (noun)	vacuity (noun)
total lack of meaning or ideas	total lack of meaning or ideas
	a region that is devoid of matter
	the absence of matter