devastation vs ruin

devastation and ruin both are nouns.

Word	Noun	Adjective	Verb	Adverb
devastation	Yes	No	No	No
ruin	Yes	No	Yes	No

As nouns, ruin is a hyponym of devastation; that is, ruin is a word with a more specific, narrower meaning than devastation:

devastation: the termination of something by causing so much damage to it that it cannot be repaired or no longer exists
ruin: destruction achieved by causing something to be wrecked or ruined

As nouns, ruin is a hypernym of devastation; that is, ruin is a word with a broader meaning than devastation:

Other hypernyms of devastation include ruination.

As nouns, ruin is a hyponym of devastation; that is, ruin is a word with a more specific, narrower meaning than devastation:

Other hyponyms of devastation include ruination, blight.

devastation (noun)	ruin (noun)
the termination of something by causing so much damage to it that it cannot be repaired or no longer exists	destruction achieved by causing something to be wrecked or ruined
plundering with excessive damage and destruction	a ruined building
an event that results in total destruction	an event that results in destruction
the feeling of being confounded or overwhelmed	failure that results in a loss of position or reputation
the state of being decayed or destroyed	the process of becoming dilapidated
	an irrecoverable state of devastation and destruction

devastation (verb)	ruin (verb)
	fall into ruin
	destroy completely; damage irreparably
	reduce to ruins
	deprive of virginity
	reduce to bankruptcy
	destroy or cause to fail