porc vs suckling pig

porc and suckling pig both are nouns.

Word	Noun	Adjective	Verb	Adverb
porc	Yes	No	No	No
suckling pig	Yes	No	No	No

As nouns, suckling pig is a hyponym of porc; that is, suckling pig is a word with a more specific, narrower meaning than porc:

Other hyponyms of porc include cochon de lait, salt pork, pigs' feet, pigs' knuckles.

porc (noun)	suckling pig (noun)
meat from a domestic hog or pig	whole young pig suitable for roasting