credulousness vs naiveness

credulousness and naiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
credulousness	Yes	No	No	No
naiveness	Yes	No	No	No

As nouns, naiveness is a hypernym of credulousness; that is, naiveness is a word with a broader meaning than credulousness:

credulousness: tendency to believe too readily and therefore to be easily deceived
naiveness: lack of sophistication or worldliness

Other hypernyms of credulousness include naivete, naivety.

credulousness (noun)	naiveness (noun)
tendency to believe too readily and therefore to be easily deceived	lack of sophistication or worldliness