hood vs cowl

hood and cowl both are nouns.

Word	Noun	Adjective	Verb	Adverb
hood	Yes	No	Yes	No
cowl	Yes	No	Yes	No

As nouns, hood and cowl are synonyms defined as:

hood and cowl: protective covering consisting of a metal part that covers the engine

Other synonyms of hood include bonnet, cowling.

As nouns, cowl is a hyponym of hood; that is, cowl is a word with a more specific, narrower meaning than hood:

Other hyponyms of hood include calash, caleche, aventail, camail, ventail.

hood (noun)	cowl (noun)
(zoology) an expandable part or marking that resembles a hood on the head or neck of an animal	protective covering consisting of a metal part that covers the engine
protective covering consisting of a metal part that covers the engine	a loose hood or hooded robe (as worn by a monk)
a headdress that protects the head and face
the folding roof of a carriage
metal covering leading to a vent that exhausts smoke or fumes
(falconry) a leather covering for a hawk's head
a tubular attachment used to keep stray light out of the lens of a camera
(slang) a neighborhood or community
a protective covering that is part of a plant
an aggressive and violent young criminal

hood (verb)	cowl (verb)
cover with a hood	cover with or as with a cowl