ridiculousness vs absurdity

ridiculousness and absurdity both are nouns.

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

As nouns, ridiculousness and absurdity are synonyms defined as:

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

Other synonyms of ridiculousness include absurdness.

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