isoclinic line vs isopleth

isoclinic line and isopleth both are nouns.

Word	Noun	Adjective	Verb	Adverb
isoclinic line	Yes	No	No	No
isopleth	Yes	No	No	No

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

isoclinic line: an isogram connecting points of equal magnetic inclination
isopleth: a line drawn on a map connecting points having the same numerical value of some variable

Other hypernyms of isoclinic line include isarithm, isogram.

isoclinic line (noun)	isopleth (noun)
an isogram connecting points of equal magnetic inclination	a line drawn on a map connecting points having the same numerical value of some variable