good sense vs sagacity

good sense and sagacity both are nouns.

Word	Noun	Adjective	Verb	Adverb
good sense	Yes	No	No	No
sagacity	Yes	No	No	No

As nouns, sagacity is a hypernym of good sense; that is, sagacity is a word with a broader meaning than good sense:

good sense: sound practical judgment
sagacity: the mental ability to understand and discriminate between relations

Other hypernyms of good sense include discernment, judgement, judgment, sagaciousness.

good sense (noun)	sagacity (noun)
sound practical judgment	the trait of forming opinions by distinguishing and evaluating
	the mental ability to understand and discriminate between relations