isocheim vs isogram

isocheim and isogram both are nouns.

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

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

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

Other hypernyms of isocheim include isarithm, isopleth.

isocheim (noun)	isogram (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