heart failure vs failure

heart failure and failure both are nouns.

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

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

heart failure: inability of the heart to pump enough blood to sustain normal bodily functions
failure: loss of ability to function normally

Other hypernyms of heart failure include cardiopathy, heart disease.

heart failure (noun)	failure (noun)
inability of the heart to pump enough blood to sustain normal bodily functions	an act that fails
	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