isogram vs isarithm

isogram and isarithm both are nouns.

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

As nouns, isogram and isarithm are synonyms defined as:

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

Other synonyms of isogram include isopleth.

isogram (noun)	isarithm (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