knacker vs butcher

knacker and butcher both are nouns.

Word	Noun	Adjective	Verb	Adverb
knacker	Yes	No	No	No
butcher	Yes	No	Yes	No

As nouns, butcher is a hypernym of knacker; that is, butcher is a word with a broader meaning than knacker:

Other hypernyms of knacker include slaughterer.

knacker (noun)	butcher (noun)
someone who buys up old horses for slaughter	a person who slaughters or dresses meat for market
someone who buys old buildings or ships and breaks them up to recover the materials in them	a brutal indiscriminate murderer
	a retailer of meat
	someone who makes mistakes because of incompetence

knacker (verb)	butcher (verb)
	kill (animals) usually for food consumption