sagacity vs sagaciousness

sagacity and sagaciousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sagacity	Yes	No	No	No
sagaciousness	Yes	No	No	No

As nouns, sagacity and sagaciousness are synonyms defined as:

sagacity and sagaciousness: the trait of forming opinions by distinguishing and evaluating

Other synonyms of sagacity include judiciousness.

As nouns, sagacity and sagaciousness are synonyms defined as:

sagacity and sagaciousness: the mental ability to understand and discriminate between relations

Other synonyms of sagacity include discernment, judgement, judgment.

sagacity (noun)	sagaciousness (noun)
the trait of forming opinions by distinguishing and evaluating	the trait of forming opinions by distinguishing and evaluating
the mental ability to understand and discriminate between relations	the mental ability to understand and discriminate between relations