subjectiveness vs perspicacity

subjectiveness and perspicacity both are nouns.

Word	Noun	Adjective	Verb	Adverb
subjectiveness	Yes	No	No	No
perspicacity	Yes	No	No	No

As nouns, perspicacity is a hypernym of subjectiveness; that is, perspicacity is a word with a broader meaning than subjectiveness:

subjectiveness: judgment based on individual personal impressions and feelings and opinions rather than external facts
perspicacity: the capacity to assess situations or circumstances shrewdly and to draw sound conclusions

Other hypernyms of subjectiveness include judgement, judgment, sound judgement, sound judgment.

subjectiveness (noun)	perspicacity (noun)
judgment based on individual personal impressions and feelings and opinions rather than external facts	the capacity to assess situations or circumstances shrewdly and to draw sound conclusions
	intelligence manifested by being astute (as in business dealings)