desolation vs forlornness

desolation and forlornness both are nouns.

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

As nouns, desolation and forlornness are synonyms defined as:

desolation and forlornness: sadness resulting from being forsaken or abandoned

Other synonyms of desolation include loneliness.

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