frostiness vs frigidness

frostiness and frigidness both are nouns.

Word	Noun	Adjective	Verb	Adverb
frostiness	Yes	No	No	No
frigidness	Yes	No	No	No

As nouns, frigidness is a hypernym of frostiness; that is, frigidness is a word with a broader meaning than frostiness:

Other hypernyms of frostiness include cold, coldness, frigidity, low temperature.

frostiness (noun)	frigidness (noun)
coldness as evidenced by frost	a lack of affection or enthusiasm
a silvery-white color	sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse
	the absence of heat