desolate vs desolation

desolate is not a noun while desolation is a noun.

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

desolate (noun)	desolation (noun)
	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

desolate (adjective)	desolation (adjective)
crushed by grief
providing no shelter or sustenance

desolate (verb)	desolation (verb)
reduce in population
cause extensive destruction or ruin utterly
leave someone who needs or counts on you; leave in the lurch