bleakness vs desolation

bleakness and desolation both are nouns.

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

As nouns, bleakness and desolation are synonyms defined as:

Other synonyms of bleakness include bareness, nakedness.

bleakness (noun)	desolation (noun)
a bleak and desolate atmosphere	an event that results in total destruction
	sadness resulting from being forsaken or abandoned
	the state of being decayed or destroyed
	a bleak and desolate atmosphere