frigidness vs gelidity

frigidness and gelidity both are nouns.

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

As nouns, gelidity is a hyponym of frigidness; that is, gelidity is a word with a more specific, narrower meaning than frigidness:

Other hyponyms of frigidness include chill, iciness, chilliness, coolness, nip, frostiness, cool.

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