isoseismal vs isogram

isoseismal and isogram both are nouns.

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

As nouns, isogram is a hypernym of isoseismal; that is, isogram is a word with a broader meaning than isoseismal:

isoseismal: a line on a map connecting points at which earthquake shocks are of equal intensity.
isogram: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isoseismal include isarithm, isopleth.

isoseismal (noun)	isogram (noun)
a line on a map connecting points at which earthquake shocks are of equal intensity.	a line drawn on a map connecting points having the same numerical value of some variable