ruination vs failure

ruination and failure both are nouns.

Word	Noun	Adjective	Verb	Adverb
ruination	Yes	No	No	No
failure	Yes	No	No	No

As nouns, failure is a hypernym of ruination; that is, failure is a word with a broader meaning than ruination:

ruination (noun)	failure (noun)
destruction achieved by causing something to be wrecked or ruined	an act that fails
an event that results in destruction	an unexpected omission
failure that results in a loss of position or reputation	an event that does not accomplish its intended purpose
an irrecoverable state of devastation and destruction	a person with a record of failing; someone who loses consistently
	lack of success
	loss of ability to function normally
	inability to discharge all your debts as they come due