failure vs copout

failure and copout both are nouns.

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

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

Other hyponyms of failure include dashing hopes, disappointment, breach.

failure (noun)	copout (noun)
an act that fails	a failure to face some difficulty squarely
an unexpected omission
an event that does not accomplish its intended purpose
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