atmosphere vs glumness

atmosphere and glumness both are nouns.

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

As nouns, glumness is a hyponym of atmosphere; that is, glumness is a word with a more specific, narrower meaning than atmosphere:

Other hyponyms of atmosphere include genius loci, gloom, gloominess, miasm, miasma, feel, feeling, flavor, flavour, look, smell, spirit, tone, headiness.

atmosphere (noun)	glumness (noun)
a distinctive but intangible quality surrounding a person or thing	a gloomy ill-tempered feeling
the mass of air surrounding the Earth	an atmosphere of depression and melancholy
the envelope of gases surrounding any celestial body
a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade
the weather or climate at some place
a particular environment or surrounding influence