Quai d'Orsay vs French Foreign Office

Quai d'Orsay and French Foreign Office both are nouns.

Word	Noun	Adjective	Verb	Adverb
Quai d'Orsay	Yes	No	No	No
French Foreign Office	Yes	No	No	No

As nouns, Quai d'Orsay and French Foreign Office are synonyms defined as:

Quai d'Orsay and French Foreign Office: the French department in charge of foreign affairs; referred to familiarly by its address in Paris

Quai d'Orsay (noun)	French Foreign Office (noun)
the French department in charge of foreign affairs; referred to familiarly by its address in Paris	the French department in charge of foreign affairs; referred to familiarly by its address in Paris
the street in Paris along the south bank of the Seine known for its governmental ministries