butcher vs pork butcher

butcher and pork butcher both are nouns.

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

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

butcher (noun)	pork butcher (noun)
a person who slaughters or dresses meat for market	a vendor of pork and products made from pork
a brutal indiscriminate murderer
a retailer of meat
someone who makes mistakes because of incompetence

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