gloominess vs uncheerfulness

gloominess and uncheerfulness both are nouns.

Word	Noun	Adjective	Verb	Adverb
gloominess	Yes	No	No	No
uncheerfulness	Yes	No	No	No

As nouns, uncheerfulness is a hypernym of gloominess; that is, uncheerfulness is a word with a broader meaning than gloominess:

gloominess (noun)	uncheerfulness (noun)
the quality of excessive mournfulness and uncheerfulness	not conducive to cheer or good spirits
The property of having a frowning or scowling appearance.	a feeling of dreary or pessimistic sadness
a feeling of melancholy apprehension
an atmosphere of depression and melancholy