fatuousness vs absurdity

fatuousness and absurdity both are nouns.

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

As nouns, fatuousness and absurdity are synonyms defined as:

Other synonyms of fatuousness include fatuity, silliness.

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