hydroisopieze vs isopieze

hydroisopieze and isopieze both are nouns.

Word	Noun	Adjective	Verb	Adverb
hydroisopieze	Yes	No	No	No
isopieze	Yes	No	No	No

As nouns, isopieze is a hypernym of hydroisopieze; that is, isopieze is a word with a broader meaning than hydroisopieze:

hydroisopieze: a line on a map connecting points of identical pressures in the water bearing stratum.
isopieze: a line on a map connecting places with equal ground water pressure.

Other hypernyms of hydroisopieze include isopiestic line.

hydroisopieze (noun)	isopieze (noun)
a line on a map connecting points of identical pressures in the water bearing stratum.	a line on a map connecting places with equal ground water pressure.