failure vs crop failure

failure and crop failure both are nouns.

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

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

Other hyponyms of failure include bankruptcy, bank failure, dead duck.

failure (noun)	crop failure (noun)
an act that fails	the failure of crops to produce a marketable surplus
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