absurdness vs absurdity

absurdness and absurdity both are nouns.

Word	Noun	Adjective	Verb	Adverb
absurdness	Yes	No	No	No
absurdity	Yes	No	No	No

As nouns, absurdness and absurdity are synonyms defined as:

absurdness and absurdity: a message whose content is at variance with reason

Other synonyms of absurdness include ridiculousness.

absurdness (noun)	absurdity (noun)
a message whose content is at variance with reason	a ludicrous folly
	a message whose content is at variance with reason