gloom vs desolation

gloom and desolation both are nouns.

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

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

Other hyponyms of gloom include cloud, bareness, bleakness, nakedness.

gloom (noun)	desolation (noun)
a feeling of melancholy apprehension	an event that results in total destruction
a state of partial or total darkness	sadness resulting from being forsaken or abandoned
an atmosphere of depression and melancholy	the state of being decayed or destroyed
	a bleak and desolate atmosphere