isochalaz vs isarithm

isochalaz and isarithm both are nouns.

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

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

isochalaz: a line indicating a constant frequency of hail storms.
isarithm: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isochalaz include isogram, isopleth.

isochalaz (noun)	isarithm (noun)
a line indicating a constant frequency of hail storms.	a line drawn on a map connecting points having the same numerical value of some variable