absurdness vs ridiculousness

absurdness and ridiculousness both are nouns.

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

As nouns, absurdness and ridiculousness are synonyms defined as:

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

Other synonyms of absurdness include absurdity.

absurdness (noun)	ridiculousness (noun)
a message whose content is at variance with reason	a message whose content is at variance with reason