nonsense vs meaninglessness

nonsense and meaninglessness both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonsense	Yes	Yes	No	No
meaninglessness	Yes	No	No	No

As nouns, nonsense and meaninglessness are synonyms defined as:

Other synonyms of nonsense include bunk, hokum, nonsensicality.

nonsense (noun)	meaninglessness (noun)
ornamental objects of no great value	the quality of having no value or significance
a message that seems to convey no meaning	a message that seems to convey no meaning

nonsense (adjective)	meaninglessness (adjective)
having no intelligible meaning