pig vs porker

pig and porker both are nouns.

Word	Noun	Adjective	Verb	Adverb
pig	Yes	No	Yes	No
porker	Yes	No	No	No

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

pig (noun)	porker (noun)
domestic swine	a pig fattened to provide meat
a crude block of metal (lead or iron) poured from a smelting furnace
mold consisting of a bed of sand in which pig iron is cast
a person regarded as greedy and pig-like
uncomplimentary terms for a policeman
a coarse obnoxious person