isocheim vs isarithm

isocheim and isarithm both are nouns.

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

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

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

Other hypernyms of isocheim include isogram, isopleth.

isocheim (noun)	isarithm (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