heart failure vs cardiopathy

heart failure and cardiopathy both are nouns.

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

As nouns, cardiopathy is a hypernym of heart failure; that is, cardiopathy 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
cardiopathy: a disease of the heart

Other hypernyms of heart failure include failure, heart disease.

heart failure (noun)	cardiopathy (noun)
inability of the heart to pump enough blood to sustain normal bodily functions	a disease of the heart