potage St. Germain vs green pea soup

potage St. Germain and green pea soup both are nouns.

Word	Noun	Adjective	Verb	Adverb
potage St. Germain	Yes	No	No	No
green pea soup	Yes	No	No	No

As nouns, potage St. Germain and green pea soup are synonyms defined as:

potage St. Germain and green pea soup: made of fresh green peas and stock with shredded lettuce onion and celery

potage St. Germain (noun)	green pea soup (noun)
made of fresh green peas and stock with shredded lettuce onion and celery	made of fresh green peas and stock with shredded lettuce onion and celery