hepatic coma vs comatoseness

hepatic coma and comatoseness both are nouns.

Word	Noun	Adjective	Verb	Adverb
hepatic coma	Yes	No	No	No
comatoseness	Yes	No	No	No

As nouns, comatoseness is a hypernym of hepatic coma; that is, comatoseness is a word with a broader meaning than hepatic coma:

hepatic coma: coma that can occur in severe cases of liver disease
comatoseness: a state of deep and often prolonged unconsciousness; usually the result of disease or injury

Other hypernyms of hepatic coma include coma.

hepatic coma (noun)	comatoseness (noun)
coma that can occur in severe cases of liver disease	a state of deep and often prolonged unconsciousness; usually the result of disease or injury