pig vs devour

pig is a noun but devour is not a noun.

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

As verbs, pig and devour are synonyms defined as:

Other synonyms of pig include guttle, raven.

pig (noun)	devour (noun)
domestic swine
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

pig (verb)	devour (verb)
give birth to (piglets)	eat greedily
eat greedily	eat up completely, as with great appetite
live like a pig, in squalor	to consume
	enjoy avidly