fallaciousness vs invalidity

fallaciousness and invalidity both are nouns.

Word	Noun	Adjective	Verb	Adverb
fallaciousness	Yes	No	No	No
invalidity	Yes	No	No	No

As nouns, invalidity is a hypernym of fallaciousness; that is, invalidity is a word with a broader meaning than fallaciousness:

fallaciousness: result of a fallacy or error in reasoning
invalidity: illogicality as a consequence of having a conclusion that does not follow from the premisses

Other hypernyms of fallaciousness include invalidness.

fallaciousness (noun)	invalidity (noun)
result of a fallacy or error in reasoning	illogicality as a consequence of having a conclusion that does not follow from the premisses