synergy vs natural action

synergy and natural action both are nouns.

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

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

synergy: the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

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

synergy (noun)	natural action (noun)
the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects	a process existing in or produced by nature (rather than by the intent of human beings)