gelidity vs frigidness

gelidity and frigidness both are nouns.

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

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

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

gelidity (noun)	frigidness (noun)
coldness due to a cold environment	a lack of affection or enthusiasm
	sexual unresponsiveness (especially of women) and inability to achieve orgasm during intercourse
	the absence of heat