essential hypertension vs hyperpiesis

essential hypertension and hyperpiesis both are nouns.

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

As nouns, essential hypertension and hyperpiesis are synonyms defined as:

essential hypertension and hyperpiesis: persistent and pathological high blood pressure for which no specific cause can be found

Other synonyms of essential hypertension include hyperpiesia.

essential hypertension (noun)	hyperpiesis (noun)
persistent and pathological high blood pressure for which no specific cause can be found	persistent and pathological high blood pressure for which no specific cause can be found