isobar vs isopleth

isobar and isopleth both are nouns.

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

As nouns, isopleth is a hypernym of isobar; that is, isopleth is a word with a broader meaning than isobar:

isobar: (meteorology)an isogram connecting points having equal barometric pressure at a given time
isopleth: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isobar include isarithm, isogram.

isobar (noun)	isopleth (noun)
(meteorology)an isogram connecting points having equal barometric pressure at a given time	a line drawn on a map connecting points having the same numerical value of some variable