pigs' knuckles vs porc

pigs' knuckles and porc both are nouns.

Word	Noun	Adjective	Verb	Adverb
pigs' knuckles	Yes	No	No	No
porc	Yes	No	No	No

As nouns, porc is a hypernym of pigs' knuckles; that is, porc is a word with a broader meaning than pigs' knuckles:

pigs' knuckles: feet or knuckles of hogs used as food; pickled or stewed or jellied
porc: meat from a domestic hog or pig

Other hypernyms of pigs' knuckles include pork.

pigs' knuckles (noun)	porc (noun)
feet or knuckles of hogs used as food; pickled or stewed or jellied	meat from a domestic hog or pig