devour vs ruin

devour is not a noun while ruin is a noun.

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

As verbs, ruin is a hypernym of devour; that is, ruin is a word with a broader meaning than devour:

Other hypernyms of devour include destroy.

devour (noun)	ruin (noun)
	destruction achieved by causing something to be wrecked or ruined
	a ruined building
	an event that results in destruction
	failure that results in a loss of position or reputation
	the process of becoming dilapidated
	an irrecoverable state of devastation and destruction

devour (verb)	ruin (verb)
eat greedily	fall into ruin
eat up completely, as with great appetite	destroy completely; damage irreparably
to consume	reduce to ruins
enjoy avidly	deprive of virginity
	reduce to bankruptcy
	destroy or cause to fail