pate de foie gras vs foie gras

pate de foie gras and foie gras both are nouns.

Word	Noun	Adjective	Verb	Adverb
pate de foie gras	Yes	No	No	No
foie gras	Yes	No	No	No

As nouns, pate de foie gras and foie gras are synonyms defined as:

pate de foie gras and foie gras: a pate made from goose liver (marinated in Cognac) and truffles

pate de foie gras (noun)	foie gras (noun)
a pate made from goose liver (marinated in Cognac) and truffles	a pate made from goose liver (marinated in Cognac) and truffles