sericulture vs natural action

sericulture and natural action both are nouns.

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

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

sericulture: raising silkworms in order to obtain raw silk
natural action: a process existing in or produced by nature (rather than by the intent of human beings)

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

sericulture (noun)	natural action (noun)
the production of raw silk by raising silkworms	a process existing in or produced by nature (rather than by the intent of human beings)
raising silkworms in order to obtain raw silk