glumness vs gloominess

glumness and gloominess both are nouns.

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

As nouns, glumness and gloominess are synonyms defined as:

Other synonyms of glumness include gloom.

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