desolation vs loneliness

desolation and loneliness both are nouns.

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

As nouns, desolation and loneliness are synonyms defined as:

desolation and loneliness: sadness resulting from being forsaken or abandoned

Other synonyms of desolation include forlornness.

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