Russian dressing vs Russian mayonnaise

Russian dressing and Russian mayonnaise both are nouns.

Word	Noun	Adjective	Verb	Adverb
Russian dressing	Yes	No	No	No
Russian mayonnaise	Yes	No	No	No

As nouns, Russian dressing and Russian mayonnaise are synonyms defined as:

Russian dressing and Russian mayonnaise: mayonnaise with horseradish grated onion and chili sauce or catsup; sometimes with caviar added

Russian dressing (noun)	Russian mayonnaise (noun)
mayonnaise with horseradish grated onion and chili sauce or catsup; sometimes with caviar added	mayonnaise with horseradish grated onion and chili sauce or catsup; sometimes with caviar added