gloominess vs glumness

gloominess and glumness both are nouns.

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

As nouns, gloominess and glumness are synonyms defined as:

Other synonyms of gloominess include gloom.

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