opacification vs natural action

opacification and natural action both are nouns.

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

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

opacification: the process of becoming cloudy or opaque
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

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

opacification (noun)	natural action (noun)
the process of becoming cloudy or opaque	a process existing in or produced by nature (rather than by the intent of human beings)