isopieze vs isarithm

isopieze and isarithm both are nouns.

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

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

isopieze: a line on a map connecting places with equal ground water pressure.
isarithm: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isopieze include isogram, isopleth.

isopieze (noun)	isarithm (noun)
a line on a map connecting places with equal ground water pressure.	a line drawn on a map connecting points having the same numerical value of some variable