parsimoniousness vs frugalness

parsimoniousness and frugalness both are nouns.

Word	Noun	Adjective	Verb	Adverb
parsimoniousness	Yes	No	No	No
frugalness	Yes	No	No	No

As nouns, frugalness is a hypernym of parsimoniousness; that is, frugalness is a word with a broader meaning than parsimoniousness:

parsimoniousness: extreme care in spending money; reluctance to spend money unnecessarily
frugalness: prudence in avoiding waste

Other hypernyms of parsimoniousness include frugality.

parsimoniousness (noun)	frugalness (noun)
extreme care in spending money; reluctance to spend money unnecessarily	prudence in avoiding waste
extreme stinginess