cowling vs protective covering

cowling and protective covering both are nouns.

Word	Noun	Adjective	Verb	Adverb
cowling	Yes	No	No	No
protective covering	Yes	No	No	No

As nouns, protective covering is a hypernym of cowling; that is, protective covering is a word with a broader meaning than cowling:

cowling: protective covering consisting of a metal part that covers the engine
protective covering: a covering that is intend to protect from damage or injury

Other hypernyms of cowling include protection, protective cover.

cowling (noun)	protective covering (noun)
protective covering consisting of a metal part that covers the engine	the tough natural covering of some organisms
	a covering that is intend to protect from damage or injury