isocheim vs isopleth

isocheim and isopleth both are nouns.

Word	Noun	Adjective	Verb	Adverb
isocheim	Yes	No	No	No
isopleth	Yes	No	No	No

As nouns, isopleth is a hypernym of isocheim; that is, isopleth is a word with a broader meaning than isocheim:

isocheim: a line on a map connecting places with the same mean winter temperature.
isopleth: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isocheim include isarithm, isogram.

isocheim (noun)	isopleth (noun)
a line on a map connecting places with the same mean winter temperature.	a line drawn on a map connecting points having the same numerical value of some variable