pork vs pork barrel

pork and pork barrel both are nouns.

Word	Noun	Adjective	Verb	Adverb
pork	Yes	No	No	No
pork barrel	Yes	No	No	No

As nouns, pork and pork barrel are synonyms defined as:

pork and pork barrel: a legislative appropriation designed to ingratiate legislators with their constituents

pork (noun)	pork barrel (noun)
meat from a domestic hog or pig	a legislative appropriation designed to ingratiate legislators with their constituents
a legislative appropriation designed to ingratiate legislators with their constituents