ecesis vs natural action

ecesis and natural action both are nouns.

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

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

ecesis: (ecology) the process by which a plant or animal becomes established in a new habitat
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

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

ecesis (noun)	natural action (noun)
(ecology) the process by which a plant or animal becomes established in a new habitat	a process existing in or produced by nature (rather than by the intent of human beings)