gloom vs atmosphere

gloom and atmosphere both are nouns.

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

As nouns, atmosphere is a hypernym of gloom; that is, atmosphere is a word with a broader meaning than gloom:

Other hypernyms of gloom include ambiance, ambience.

gloom (noun)	atmosphere (noun)
a feeling of melancholy apprehension	a distinctive but intangible quality surrounding a person or thing
a state of partial or total darkness	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