isocryme vs isarithm

isocryme and isarithm both are nouns.

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

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

isocryme: a line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.
isarithm: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isocryme include isogram, isopleth.

isocryme (noun)	isarithm (noun)
a line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.	a line drawn on a map connecting points having the same numerical value of some variable