hyperpiesis vs hypertension

hyperpiesis and hypertension both are nouns.

Word	Noun	Adjective	Verb	Adverb
hyperpiesis	Yes	No	No	No
hypertension	Yes	No	No	No

As nouns, hypertension is a hypernym of hyperpiesis; that is, hypertension is a word with a broader meaning than hyperpiesis:

hyperpiesis: persistent and pathological high blood pressure for which no specific cause can be found
hypertension: a common disorder in which blood pressure remains abnormally high (a reading of 140/90 mm Hg or greater)

Other hypernyms of hyperpiesis include high blood pressure.

hyperpiesis (noun)	hypertension (noun)
persistent and pathological high blood pressure for which no specific cause can be found	a common disorder in which blood pressure remains abnormally high (a reading of 140/90 mm Hg or greater)