cataphoresis vs natural action

cataphoresis and natural action both are nouns.

Word	Noun	Adjective	Verb	Adverb
cataphoresis	Yes	No	No	No
natural action	Yes	No	No	No

As nouns, natural action is a hypernym of cataphoresis; that is, natural action is a word with a broader meaning than cataphoresis:

cataphoresis: the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

Other hypernyms of cataphoresis include action, activity, natural process.

cataphoresis (noun)	natural action (noun)
the motion of charged particles in a colloid under the influence of an electric field; particles with a positive charge go to the cathode and negative to the anode	a process existing in or produced by nature (rather than by the intent of human beings)