inanity vs pointlessness

inanity and pointlessness both are nouns.

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

As nouns, inanity and pointlessness are synonyms defined as:

Other synonyms of inanity include mindlessness, senselessness, vacuity.

inanity (noun)	pointlessness (noun)
total lack of meaning or ideas	total lack of meaning or ideas