isophene vs isarithm

isophene and isarithm both are nouns.

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

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

isophene: a line indicating biological events occurring with coincidence such as plants flowering.
isarithm: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isophene include isogram, isopleth.

isophene (noun)	isarithm (noun)
a line indicating biological events occurring with coincidence such as plants flowering.	a line drawn on a map connecting points having the same numerical value of some variable