ridiculousness vs absurdness

ridiculousness and absurdness both are nouns.

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

As nouns, ridiculousness and absurdness are synonyms defined as:

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

Other synonyms of ridiculousness include absurdity.

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