gloominess vs apprehension

gloominess and apprehension both are nouns.

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

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

Other hypernyms of gloominess include apprehensiveness, dread, melancholy.

gloominess (noun)	apprehension (noun)
the quality of excessive mournfulness and uncheerfulness	the act of apprehending (especially apprehending a criminal)
The property of having a frowning or scowling appearance.	the cognitive condition of someone who understands
a feeling of melancholy apprehension	painful expectation
an atmosphere of depression and melancholy	fearful expectation or anticipation