isarithm vs isopleth

isarithm and isopleth both are nouns.

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

As nouns, isarithm and isopleth are synonyms defined as:

isarithm and isopleth: a line drawn on a map connecting points having the same numerical value of some variable

Other synonyms of isarithm include isogram.

isarithm (noun)	isopleth (noun)
a line drawn on a map connecting points having the same numerical value of some variable	a line drawn on a map connecting points having the same numerical value of some variable