oscillation vs natural action

oscillation and natural action both are nouns.

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

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

oscillation: the process of oscillating between states
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

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

oscillation (noun)	natural action (noun)
(physics) a regular periodic variation in value about a mean	a process existing in or produced by nature (rather than by the intent of human beings)
a single complete execution of a periodically repeated phenomenon
the process of oscillating between states