gloominess vs gloomy

gloominess is a noun but gloomy is not a noun.

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

gloominess (noun)	gloomy (noun)
the quality of excessive mournfulness and uncheerfulness
The property of having a frowning or scowling appearance.
a feeling of melancholy apprehension
an atmosphere of depression and melancholy

gloominess (adjective)	gloomy (adjective)
	depressingly dark
	filled with melancholy and despondency
	causing dejection