gloominess vs lugubriousness

gloominess and lugubriousness both are nouns.

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

As nouns, gloominess and lugubriousness are synonyms defined as:

gloominess and lugubriousness: the quality of excessive mournfulness and uncheerfulness

Other synonyms of gloominess include sadness.

gloominess (noun)	lugubriousness (noun)
the quality of excessive mournfulness and uncheerfulness	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