oxygenation vs natural action

oxygenation and natural action both are nouns.

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

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

oxygenation: the process of providing or combining or treating with oxygen
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

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

oxygenation (noun)	natural action (noun)
the process of providing or combining or treating with oxygen	a process existing in or produced by nature (rather than by the intent of human beings)