salt pork vs sowbelly

salt pork and sowbelly both are nouns.

Word	Noun	Adjective	Verb	Adverb
salt pork	Yes	No	No	No
sowbelly	Yes	No	No	No

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

salt pork: fat from the back and sides and belly of a hog carcass cured with salt
sowbelly: salt pork from the belly of a hog carcass

Other hyponyms of salt pork include fatback.

salt pork (noun)	sowbelly (noun)
fat from the back and sides and belly of a hog carcass cured with salt	salt pork from the belly of a hog carcass