mushroom wine sauce vs marchand de vin

mushroom wine sauce and marchand de vin both are nouns.

Word	Noun	Adjective	Verb	Adverb
mushroom wine sauce	Yes	No	No	No
marchand de vin	Yes	No	No	No

As nouns, mushroom wine sauce and marchand de vin are synonyms defined as:

mushroom wine sauce and marchand de vin: brown sauce with mushrooms and red wine or Madeira

mushroom wine sauce (noun)	marchand de vin (noun)
brown sauce with mushrooms and red wine or Madeira	brown sauce with mushrooms and red wine or Madeira