mother wit vs sagaciousness

mother wit and sagaciousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
mother wit	Yes	No	No	No
sagaciousness	Yes	No	No	No

As nouns, sagaciousness is a hypernym of mother wit; that is, sagaciousness is a word with a broader meaning than mother wit:

mother wit: sound practical judgment
sagaciousness: the mental ability to understand and discriminate between relations

Other hypernyms of mother wit include discernment, judgement, judgment, sagacity.

mother wit (noun)	sagaciousness (noun)
sound practical judgment	the trait of forming opinions by distinguishing and evaluating
	the mental ability to understand and discriminate between relations