desolate vs ravage

desolate is not a noun while ravage is a noun.

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

As verbs, desolate and ravage are synonyms defined as:

Other synonyms of desolate include devastate, lay waste to, scourge, waste.

desolate (noun)	ravage (noun)
	(usually plural) a destructive action

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

desolate (verb)	ravage (verb)
reduce in population	make a pillaging or destructive raid on (a place), as in wartimes
cause extensive destruction or ruin utterly	cause extensive destruction or ruin utterly
leave someone who needs or counts on you; leave in the lurch