credulousness vs gullibility

credulousness and gullibility both are nouns.

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

As nouns, credulousness and gullibility are synonyms defined as:

credulousness and gullibility: tendency to believe too readily and therefore to be easily deceived

credulousness (noun)	gullibility (noun)
tendency to believe too readily and therefore to be easily deceived	tendency to believe too readily and therefore to be easily deceived