dead body vs kill

dead body and kill both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead body	Yes	No	No	No
kill	Yes	No	Yes	No

As nouns, kill is a hyponym of dead body; that is, kill is a word with a more specific, narrower meaning than dead body:

dead body: a natural object consisting of a dead animal or person
kill: the body of an animal, or bodies of animals, killed by a person or another animal

Other hyponyms of dead body include carcase, carcass, carrion, roadkill, cadaver, clay, corpse, remains, stiff, mummy.

dead body (noun)	kill (noun)
a natural object consisting of a dead animal or person	the act of terminating a life
	the destruction of an enemy plane or ship or tank or missile
	the body of an animal, or bodies of animals, killed by a person or another animal

dead body (verb)	kill (verb)
	mark for deletion, rub off, or erase
	destroy a vitally essential quality of or in
	cause to cease operating
	tire out completely
	end or extinguish by forceful means
	drink down entirely
	cause to die; put to death, usually intentionally or knowingly
	cause the death of, without intention
	deprive of life
	hit with great force
	hit with so much force as to make a return impossible, in racket games
	overwhelm with hilarity, pleasure, or admiration
	be the source of great pain for
	thwart the passage of
	be fatal